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Today — October 30th 2024فیزیک و مهندسی
Yesterday — October 29th 2024فیزیک و مهندسی
  • ✇Astronomy Magazine
  • How Yerkes Observatory started overSamantha Hill
    The town of Williams Bay, Wisconsin is much like any other small city on a lake, with an offering of tourist shops and an active beach. But just a short drive past the activity brings you to Yerkes Observatory. Behind an opening of trees stands a sprawling, grand estate with a well-manicured lawn and aContinue reading "How Yerkes Observatory started over" The post How Yerkes Observatory started over appeared first on Astronomy Magazine.
     

How Yerkes Observatory started over

October 29th 2024 at 6:37 pm

The town of Williams Bay, Wisconsin is much like any other small city on a lake, with an offering of tourist shops and an active beach. But just a short drive past the activity brings you to Yerkes Observatory. Behind an opening of trees stands a sprawling, grand estate with a well-manicured lawn and aContinue reading "How Yerkes Observatory started over"

The post How Yerkes Observatory started over appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Astronomers find a mini black holeAlison Klesman
    Astronomers have discovered a lightweight black hole that’s a bit of a cosmic conundrum. Hypothetically, black hole masses can range all the way from far less than a paperclip to at least tens of billions of times more than the Sun. But observations have revealed a strange scarcity of black holes between about two andContinue reading "Astronomers find a mini black hole" The post Astronomers find a mini black hole appeared first on Astronomy Magazine.
     

Astronomers find a mini black hole

October 29th 2024 at 3:30 pm

Astronomers have discovered a lightweight black hole that’s a bit of a cosmic conundrum. Hypothetically, black hole masses can range all the way from far less than a paperclip to at least tens of billions of times more than the Sun. But observations have revealed a strange scarcity of black holes between about two andContinue reading "Astronomers find a mini black hole"

The post Astronomers find a mini black hole appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Ring of fireMark Zastrow
    Vikas Chander, taken from Observatorio El Sauce, Chile NGC 1291 (also cataloged as NGC 1269) lies 33 million light-years away in Eridanus. At 12 billion years old, the galaxy has lost most of its spiral structure and matured into a transitional state — yet it has an outer ring that still forming stars, appearing blue inContinue reading "Ring of fire" The post Ring of fire appeared first on Astronomy Magazine.
     

Ring of fire

October 28th 2024 at 11:47 pm

Vikas Chander, taken from Observatorio El Sauce, Chile NGC 1291 (also cataloged as NGC 1269) lies 33 million light-years away in Eridanus. At 12 billion years old, the galaxy has lost most of its spiral structure and matured into a transitional state — yet it has an outer ring that still forming stars, appearing blue inContinue reading "Ring of fire"

The post Ring of fire appeared first on Astronomy Magazine.

Before yesterdayفیزیک و مهندسی
  • ✇Astronomy Magazine
  • For sale: One Boeing space program, says reportKorey Haynes
    The Wall Street Journal reported on Friday that Boeing is getting out of the space business — or trying to. Part of a wider move to trim and improve business holdings and operations, the company is looking to offload its space program, assuming it can find a suitable buyer. Boeing has been one of NASA’sContinue reading "For sale: One Boeing space program, says report" The post For sale: One Boeing space program, says report appeared first on Astronomy Magazine.
     

For sale: One Boeing space program, says report

October 28th 2024 at 10:18 pm

The Wall Street Journal reported on Friday that Boeing is getting out of the space business — or trying to. Part of a wider move to trim and improve business holdings and operations, the company is looking to offload its space program, assuming it can find a suitable buyer. Boeing has been one of NASA’sContinue reading "For sale: One Boeing space program, says report"

The post For sale: One Boeing space program, says report appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Observe the Andromeda Galaxy: This Week in Astronomy with Dave EicherDavid J. Eicher
    In this episode, Dave Eicher invites you to observe one of the most famous deep-sky objects, the Andromeda Galaxy, also known as Messier 31 (M31). Named for its location in the constellation Andromeda the Princess, M31 lies some 2.5 million light-years from Earth. While sharp-eyed observers can see it without optical aid, binoculars and telescopes giveContinue reading "Observe the Andromeda Galaxy: This Week in Astronomy with Dave Eicher" The post Observe the Andromeda Galaxy: This Week in Astro
     

Observe the Andromeda Galaxy: This Week in Astronomy with Dave Eicher

October 28th 2024 at 7:34 pm

In this episode, Dave Eicher invites you to observe one of the most famous deep-sky objects, the Andromeda Galaxy, also known as Messier 31 (M31). Named for its location in the constellation Andromeda the Princess, M31 lies some 2.5 million light-years from Earth. While sharp-eyed observers can see it without optical aid, binoculars and telescopes giveContinue reading "Observe the Andromeda Galaxy: This Week in Astronomy with Dave Eicher"

The post Observe the Andromeda Galaxy: This Week in Astronomy with Dave Eicher appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Astronomers find out the first known brown dwarf is actually twinsAlison Klesman
    In 1995, a parallel race was on in astronomy — one to find the first planet beyond our own solar system, and the other to find the first brown dwarf, a class of object too heavy to be a planet, but below the mass of a star.  Astronomers ended up publishing the discovery of theContinue reading "Astronomers find out the first known brown dwarf is actually twins" The post Astronomers find out the first known brown dwarf is actually twins appeared first on Astronomy Magazine.
     

Astronomers find out the first known brown dwarf is actually twins

October 28th 2024 at 6:30 pm

In 1995, a parallel race was on in astronomy — one to find the first planet beyond our own solar system, and the other to find the first brown dwarf, a class of object too heavy to be a planet, but below the mass of a star.  Astronomers ended up publishing the discovery of theContinue reading "Astronomers find out the first known brown dwarf is actually twins"

The post Astronomers find out the first known brown dwarf is actually twins appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • How the Cluster II mission studied the Sun’s effects on EarthSten Odenwald
    On July 26, 2000, the European Space Agency (ESA) launched the Salsa satellite, which joined its three companion satellites — Samba, Rumba, and Tango — on the Cluster II mission, scheduled to last two years. On Sep. 8, after more than 24 years of service, Salsa re-entered Earth’s atmosphere in a controlled de-orbit, where itContinue reading "How the Cluster II mission studied the Sun’s effects on Earth" The post How the Cluster II mission studied the Sun’s effects on Earth appeared first on Astr
     

How the Cluster II mission studied the Sun’s effects on Earth

October 28th 2024 at 4:30 pm

On July 26, 2000, the European Space Agency (ESA) launched the Salsa satellite, which joined its three companion satellites — Samba, Rumba, and Tango — on the Cluster II mission, scheduled to last two years. On Sep. 8, after more than 24 years of service, Salsa re-entered Earth’s atmosphere in a controlled de-orbit, where itContinue reading "How the Cluster II mission studied the Sun’s effects on Earth"

The post How the Cluster II mission studied the Sun’s effects on Earth appeared first on Astronomy Magazine.

NASA still working to 'correct and rectify' Boeing Starliner issues after 1st test flight with astronauts

Boeing's Starliner had propulsion issues after launching on its first test mission with astronauts. Six weeks after the mission concluded, NASA is working on what to do next.

© NASA TV

Apollo 14 astronaut's personal moon-flown Rolex watch sells for record $2.2 million

October 26th 2024 at 4:30 pm
A Rolex watch that was flown to the moon is now the most expensive astronaut timepiece to sell at auction. The personal GMT-Master chronometer worn by Edgar Mitchell sold for $2.2 million.

© RR Auction/NASA via collectSPACE.com

  • ✇Astronomy Magazine
  • Is this black hole jet making stars explode?Daniela Mata
    Supernovae, the violent explosions that occur when stars die, normally happen sporadically within galaxies. However, by shifting the angle of the Hubble Space Telescope’s line of sight toward M87, astronomers recently spotted double the expected amount of supernovae along a massive 3,000-light-year-long jet blasting out of the supermassive black hole at the galaxy’s center. ResearchersContinue reading "Is this black hole jet making stars explode?" The post Is this black hole jet making stars exp
     

Is this black hole jet making stars explode?

October 25th 2024 at 11:03 pm

Supernovae, the violent explosions that occur when stars die, normally happen sporadically within galaxies. However, by shifting the angle of the Hubble Space Telescope’s line of sight toward M87, astronomers recently spotted double the expected amount of supernovae along a massive 3,000-light-year-long jet blasting out of the supermassive black hole at the galaxy’s center. ResearchersContinue reading "Is this black hole jet making stars explode?"

The post Is this black hole jet making stars explode? appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Lighting the wayMark Zastrow
    Moshen Chan from San Francisco, California The tail of Comet Tsuchinshan-ATLAS (C/2023 A3) fans out over the Pacific Ocean and the Point Reyes Lighthouse in California. The photographer used a Sony mirrorless camera and 20mm f/1.8 lens to take sixteen 10-second subframes. The post Lighting the way appeared first on Astronomy Magazine.
     

Lighting the way

October 25th 2024 at 9:47 pm

Moshen Chan from San Francisco, California The tail of Comet Tsuchinshan-ATLAS (C/2023 A3) fans out over the Pacific Ocean and the Point Reyes Lighthouse in California. The photographer used a Sony mirrorless camera and 20mm f/1.8 lens to take sixteen 10-second subframes.

The post Lighting the way appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Betelgeuse may have a BetelbuddyKorey Haynes
    The bright red supergiant star Betelgeuse has long been a familiar sight for star watchers, winking with a ruddy glow from the shoulder of Orion the Hunter. But it’s also an increasingly popular target for professional astronomers thanks to its scientific peculiarities, ranging from pulsations to mysterious dimming events. Now, astronomers think they may haveContinue reading "Betelgeuse may have a Betelbuddy" The post Betelgeuse may have a Betelbuddy appeared first on Astronomy Magazine.
     

Betelgeuse may have a Betelbuddy

October 25th 2024 at 7:56 pm

The bright red supergiant star Betelgeuse has long been a familiar sight for star watchers, winking with a ruddy glow from the shoulder of Orion the Hunter. But it’s also an increasingly popular target for professional astronomers thanks to its scientific peculiarities, ranging from pulsations to mysterious dimming events. Now, astronomers think they may haveContinue reading "Betelgeuse may have a Betelbuddy"

The post Betelgeuse may have a Betelbuddy appeared first on Astronomy Magazine.

Massive, bustling Perseus galaxy cluster dazzles in new telescope image

October 25th 2024 at 1:30 pm
Deep in the heart of the massive Perseus cluster, giant galaxies stir, stars are torn from their homes and hot gas radiates at more than 1 million degrees Celsius.

© International Gemini Observatory/NOIRLab/NSF/AURA/J. Miller and M. Rodriguez (International Gemini Observatory/NSF NOIRLab)/T. A. Rector (University of Alaska Anchorage/NSF NOIRLab)/M. Zamani (NSF NOIRLab)/Jisu Kang (Seoul National University)

  • ✇Astronomy Magazine
  • The Sky This Week from October 25 to November 1: Callisto slips south of JupiterAlison Klesman
    Friday, October 25Venus passes 3° north of Antares at 3 P.M. EDT. The pair is very low in the southwest, but if you’ve got a clear horizon, both should be visible some 40 minutes after sunset. Venus stands out first, glowing a brilliant magnitude –4. Compare its light to dimmer, magnitude 1.1 Antares, to theContinue reading "The Sky This Week from October 25 to November 1: Callisto slips south of Jupiter" The post The Sky This Week from October 25 to November 1: Callisto slips south of Jupiter a
     

The Sky This Week from October 25 to November 1: Callisto slips south of Jupiter

October 25th 2024 at 8:30 am

Friday, October 25Venus passes 3° north of Antares at 3 P.M. EDT. The pair is very low in the southwest, but if you’ve got a clear horizon, both should be visible some 40 minutes after sunset. Venus stands out first, glowing a brilliant magnitude –4. Compare its light to dimmer, magnitude 1.1 Antares, to theContinue reading "The Sky This Week from October 25 to November 1: Callisto slips south of Jupiter"

The post The Sky This Week from October 25 to November 1: Callisto slips south of Jupiter appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • What to watch: NASA Crew-8 astronauts set for early Friday splashdownMark Zastrow
    Four NASA astronauts are set to splash down Friday morning after spending more than 200 days aboard the International Space Station (ISS). The four-person crew of NASA’s Crew-8 mission — comprising NASA astronauts Matthew Dominick, Michael Barratt, and Jeanette Epps, and Roscosmos cosmonaut Alexander Grebenkin — will return to Earth around dawn on Friday, splashing downContinue reading "What to watch: NASA Crew-8 astronauts set for early Friday splashdown" The post What to watch: NASA Crew-8 ast
     

What to watch: NASA Crew-8 astronauts set for early Friday splashdown

October 25th 2024 at 1:05 am

Four NASA astronauts are set to splash down Friday morning after spending more than 200 days aboard the International Space Station (ISS). The four-person crew of NASA’s Crew-8 mission — comprising NASA astronauts Matthew Dominick, Michael Barratt, and Jeanette Epps, and Roscosmos cosmonaut Alexander Grebenkin — will return to Earth around dawn on Friday, splashing downContinue reading "What to watch: NASA Crew-8 astronauts set for early Friday splashdown"

The post What to watch: NASA Crew-8 astronauts set for early Friday splashdown appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • XRISM’s data debut proves its extraordinary capabilitiesDaniela Mata
    The X-Ray Imaging and Spectroscopy Mission (XRISM) isn’t the first of its kind, but the state-of-the-art spectroscopic instruments onboard have opened new doors for high-energy astrophysics.  Active galactic nuclei (AGN) —  supermassive black holes that actively gobble material and shine brightly in the resulting chaos — have always held mysteries for astrophysicists. Now, a yearContinue reading "XRISM’s data debut proves its extraordinary capabilities" The post XRISM’s data debut proves its ext
     

XRISM’s data debut proves its extraordinary capabilities

October 23rd 2024 at 11:10 pm

The X-Ray Imaging and Spectroscopy Mission (XRISM) isn’t the first of its kind, but the state-of-the-art spectroscopic instruments onboard have opened new doors for high-energy astrophysics.  Active galactic nuclei (AGN) —  supermassive black holes that actively gobble material and shine brightly in the resulting chaos — have always held mysteries for astrophysicists. Now, a yearContinue reading "XRISM’s data debut proves its extraordinary capabilities"

The post XRISM’s data debut proves its extraordinary capabilities appeared first on Astronomy Magazine.

Mini '2001' monoliths fly into space on first flight of Blue Origin's 2nd crew ship

October 23rd 2024 at 10:30 pm
A number of black slabs modeled after the monoliths in "2001: A Space Odyssey" have made the trip into space and back on the first flight of Blue Origin's second human-rated launch vehicle.

© Blue Origin/Amaranthine Books/collectSPACE.com

  • ✇Astronomy Magazine
  • Center stageMark Zastrow
    Lucas Thibaud, taken near Cerro Pachon in Chile The Milky Way serves as a proscenium arch for the zodiacal light and Comet C/2023 A3 (Tsuchinshan-ATLAS) in this panorama taken Oct. 19 from the Chilean Andes. The photographer used a Canon 6Da DSLR and a 20mm f/1.4 lens to take twelve 8-second frames at ISO 1600. The post Center stage appeared first on Astronomy Magazine.
     

Center stage

October 23rd 2024 at 8:54 pm

Lucas Thibaud, taken near Cerro Pachon in Chile The Milky Way serves as a proscenium arch for the zodiacal light and Comet C/2023 A3 (Tsuchinshan-ATLAS) in this panorama taken Oct. 19 from the Chilean Andes. The photographer used a Canon 6Da DSLR and a 20mm f/1.4 lens to take twelve 8-second frames at ISO 1600.

The post Center stage appeared first on Astronomy Magazine.

How to reduce your carbon footprint when shopping this Black Friday and Cyber Monday

October 23rd 2024 at 8:30 pm
Be mindful of the environment — there are steps you can take to keep your carbon footprint as low as possible when shopping for Black Friday deals.

© Photo by <a href="https://unsplash.com/@shutter_speed_?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Shutter Speed</a> on <a href="https://unsplash.com/photos/a-toy-shopping-cart-BQ9usyzHx_w?utm_content=creditCopyText&utm_medium=referral&utm_source=unsplash">Unsplash</a>

  • ✇Astronomy Magazine
  • Crew-8 has returned from space on record-breaking SpaceX capsuleBen Evans
    When SpaceX’s Crew Dragon capsule Endeavour returns to Earth this week, she will set a clutch of records for the most time spent in space by a crewed spacecraft. Launched for her fifth mission in March, Endeavour has notched 23 cumulative months in orbit, circled Earth 11,000 times and traveled 292 million miles (470 millionContinue reading "Crew-8 has returned from space on record-breaking SpaceX capsule" The post Crew-8 has returned from space on record-breaking SpaceX capsule appeared first o
     

Crew-8 has returned from space on record-breaking SpaceX capsule

By: Ben Evans
October 22nd 2024 at 10:44 pm

When SpaceX’s Crew Dragon capsule Endeavour returns to Earth this week, she will set a clutch of records for the most time spent in space by a crewed spacecraft. Launched for her fifth mission in March, Endeavour has notched 23 cumulative months in orbit, circled Earth 11,000 times and traveled 292 million miles (470 millionContinue reading "Crew-8 has returned from space on record-breaking SpaceX capsule"

The post Crew-8 has returned from space on record-breaking SpaceX capsule appeared first on Astronomy Magazine.

  • ✇اسطرلاب (StarYab)
  • شکل‌گیری کهکشان‌های پرجرم و فشرده‌ی عتیقه در چارچوب نظریه‌ی MONDالهام افتخاری
    MOND یا دینامیک Milgromian یک چارچوب نظری است که پارادایم ماده‌ی تاریک را به چالش می‌کشد (این‌جا بیش‌تر راجع به ماده‌ی تاریک بخوانید) . MOND که توسط Mordehai Milgrom در دهه‌ی ۱۹۸۰ پیشنهاد شد، توضیحی جایگزین برای منحنی چرخش غیرعادی کهکشان‌ها ارائه می‌کند. طبق قوانین نیوتن، نواحی بیرونی کهکشان‌ها باید کندتر از آنچه که ما مشاهده می‌کنیم، بچرخند. برای توضیح این مشاهده، معمولاً به وجود ماده‌ی تاریک استناد می شود. ولی MOND پیشنهاد می‌کند که در شتاب‌های بسیار کم – کم‌تر از حدود ۱/۲*۱۰×-۱۰ m/s^2 – برهمک
     

شکل‌گیری کهکشان‌های پرجرم و فشرده‌ی عتیقه در چارچوب نظریه‌ی MOND

MOND یا دینامیک Milgromian یک چارچوب نظری است که پارادایم ماده‌ی تاریک را به چالش می‌کشد (این‌جا بیش‌تر راجع به ماده‌ی تاریک بخوانید) . MOND که توسط Mordehai Milgrom در دهه‌ی ۱۹۸۰ پیشنهاد شد، توضیحی جایگزین برای منحنی چرخش غیرعادی کهکشان‌ها ارائه می‌کند. طبق قوانین نیوتن، نواحی بیرونی کهکشان‌ها باید کندتر از آنچه که ما مشاهده می‌کنیم، بچرخند. برای توضیح این مشاهده، معمولاً به وجود ماده‌ی تاریک استناد می شود. ولی MOND پیشنهاد می‌کند که در شتاب‌های بسیار کم – کم‌تر از حدود ۱/۲*۱۰×-۱۰ m/s^2 – برهمکنش‌های گرانشی از قوانین نیوتن (مربع معکوس) پیروی نمی‌کنند و نیرو‌های گرانشی قوی‌تر از حالت نیوتونی هستند. بدین ترتیب MOND بدون فرض وجود ماده‌ی تاریک می‌تواند دلیل چرخش سریع‌تر ستاره‌ها در لبه‌های بیرونی کهکشان‌ها را توضیح دهد. با وجود آن‌که MOND در توضیح برخی پدیده‌ها در مقیاس کهکشانی موفق بوده است، اما در در توضیح تابش ‌پس‌زمینه‌ی کیهانی و ساختارهای بزرگ-مقیاس۱ عالم با چالش‌های جدی رو به‌روست.

به طور کلی ما با رصد آسمان تصویری از جهان به دست می‌آوریم که برای توضیح این تصویر از مدل‌های کیهان‌شناسی کمک می‌گیریم. در این مقاله با دو مدل مختلف برای توجیه رصدها آشنا می‌شویم: مدل استاندارد کیهان‌شناسی و یا Lambda-CDM و مدل MOND.

تصویری که رصدها از شکل‌گیری و تحول کهکشان‌ها به ما می‌دهند یک تصویر کوچک‌سازی شده‌است؛ بدین صورت که کهکشان‌های کم‌جرم، ستاره‌زایی ممتد۲ دارند- به عبارت دیگر ستاره‌زایی آن‌ها از ابتدای شکل‌گیری کهکشان تاکنون ادامه‌داشته است در‌حالی‌که کهکشان‌های پرجرم بیش‌تر ستاره‌های خود را در انتقال به سرخ‌های بالا (z>2) و در مدت زمان کوتاهی به وجود آورده‌اند.

در چارچوب Lambda-CDM، سناریویی برای توضیح این تصویر وجود دارد که سناریوی تشکیل کهکشان دوفازی۳ نامیده می‌شود. طبق این سناریو، در فاز اول، هسته‌ی کهکشان‌های پرجرم از طریق فروپاشی یکپارچه‌ی ابر گازی۴، در زمان‌های اولیه‌ی عالم و در مدت زمان خیلی کوتاهی به وجود آمده است. به این هسته‌ی اولیه ناگت قرمز۵ گفته می‌شود. سپس در فاز دوم به واسطه‌ی برافزایش۶ و ادغام‌های کهکشانی۷ سایز کهکشان بزرگ می‌شود. بدین ترتیب این سناریو می‌تواند کهکشان‌های نوع اولیه‌ی پرجرم۸ در عالم نزدیک۹ را توضیح دهد. این سناریو همچنین پیش‌بینی می‌کند که تعداد کمی‌ از ناگت‌های قرمز وارد فاز دوم نمی‌شوند و به صورت دست‌نخورده تا z~0 باقی می‌مانند. چنین سیستم‌های ستاره‌ای که نماینده‌ی کهکشان‌های خاموش۱۰ و فشرده۱۱ در zهای بالا هستند اخیرا در جهان پیرامون ما مشاهده شده‌اند. چنین کهکشان‌هایی در جهان نزدیک، کهکشان عتیقه نامیده می‌شوند. این‌طور به نظر می‌رسد که چارچوب Lambda-CDM به خوبی کار می‌کند اما این چارچوب مشخص نمی‌کند که چگونه و چرا چنین کهکشان‌های پرجرمی در کیهان اولیه و در مدت زمان کوتاه‌تری نسبت به کهکشان‌های کم‌جرم شکل گرفته‌اند.

در این مقاله خواهیم دید که در نظریه‌ی MOND، مقیاس زمانی کوتاه ستاره‌زایی۱۲ در کهکشان‌های نوع اولیه‌ی پرجرم می‌تواند نتیجه‌ی طبیعی این نظریه تحت یک سری از شرایط خاص باشد.

در کیهان‌شناسی، شبیه‌سازی‌هایی برای فروپاشی ابرهای گازی پس از مهبانگ۱۳ بر اساس MOND وجود دارد. این شبیه‌سازی‌ها نشان می‌دهند که با فروپاشی ابرهای گازی چرخان، خصوصیات رصدی کهکشان‌های دیسکی قابل بازیابی است. اما آن‌ها همزمان این را هم نشان می‌دهند که چنین کهکشان‌هایی ممکن است عمده‌ی جرم ستاره‌ای خود را اخیرا از طریق ادغام کهکشان‌های ستاره‌زا به دست آورده باشند. نویسندگان این مقاله با استناد به نتایج مقالات سالوادور و همکاران ۲۰۲۲ و افتخاری و همکاران ۲۰۲۲ ادعا می‌کنند که چنین نتیجه‌ای در تضاد با رصدهای کهکشانی هست. این دو مقاله با استفاده از طیف فرابنفش نزدیک، اپتیکی و فروسرخ نزدیک کهکشان‌های نوع-اولیه‌ی پرجرم و هم‌چنین یک کهکشان‌ عتیقه نشان داده‌اند که اکثر ستاره‌های کهکشان‌های پرجرم نوع اولیه پیر هستند و تحول این کهکشان‌ها تا به امروز منفعل بوده‌است. بنابراین آن‌ها علاوه بر شبیه‌سازی‌های ابرهای گازی چرخان، کهکشان‌های حاصل از شبیه‌سازی‌های ابرهای گازی غیرچرخان را هم مورد مطالعه قرار دادند و مشاهده کردند که کهکشان‌های حاصل مقیاس زمانی ستاره‌زایی کوتاهی مشابه کهکشان‌هایی که رصد شده‌اند، دارند. به عبارت دیگر، چارچوب MOND با فروپاشی ابرهای گازی غیرچرخان پس از بیگ بنگ می‌تواند کهکشان‌های پرجرمی با مقیاس زمانی ستاره‌زایی کوتاهی مشابه رصدها تولید کند.

نویسندگان یکی از کهکشان‌های مدل را که از طریق فروپاشی یک‌پارچه‌ی یک ابر گازی غیرچرخان شکل گرفته‌است را انتخاب کرده و سینماتیک و پروفایل چگالی جرم ستاره‌ای آن را با کهکشان‌های پرجرم فشرده‌ی عتیقه مقایسه می‌کنند و ثابت می‌کنند که حاصل شبیه‌سازی MOND برای ابر گازی غیرچرخان یک کهکشان عتیقه هست که مقیاس زمانی ستاره‌زایی کوتاهی دارد. کهکشان‌های عتیقه‌‌ی رصدشده‌ای که آن‌ها در این مطالعه استفاده کرده‌اند NGC 1277، Mrk 1216 و PGC 032873 می‌باشند که از مطالعات تروخیو و همکاران ۲۰۱۴ و فر-متیو و همکاران ۲۰۱۷ گرفته شده‌اند.

آن‌ها پروفایل سرعت چرخشی کهکشان مدل MOND را با کهکشان‌های عتیقه‌ی رصد شده مقایسه می‌کنند (شکل ۱). برخلاف کهکشان‌های نوع اولیه‌ی معمولی، کهکشان‌های عتیقه سرعت‌ چرخشی بالایی دارند و کهکشان مدل نیز از این الگو پیروی می‌کند.

fig1

شکل ۱. مقایسه‌ی پروفایل سرعت چرخشی کهکشان مدل MOND (آبی) با کهکشان‌های عتیقه‌ی رصد شده.

نویسندگان همچنین پروفایل پراکندگی سرعت۱۴ کهکشان مدل را با کهکشان‌های عتیقه مقایسه می‌کنند. شکل ۲ نشان می‌دهد که کهکشان‌های عتیقه‌ی رصد شده پراکندگی سرعت بالایی دارند و سرعت بیشینه‌ در مرکز کهکشان مدل، مشابه کهکشان‌های عتیقه هست اما افت سرعت کهکشان مدل مانند آن‌ها نیست؛ به خصوص که بیش‌ترین تقاوت مربوط به کهکشان NGC1277 هست. نویسندگان ادعا می‌کنند که این به دلیل اثر میدان خارجی۱۵ می‌تواند باشد. به عبارتی کهکشان مدل یک کهکشان ایزوله هست در حالی‌که کهکشان NGC1277 در یک خوشه‌ی کهکشانی قرار دارد.

fig2

شکل ۲. مقایسه‌ی پروفایل پراکندگی سرعت کهکشان مدل MOND (آبی) با کهکشان‌های عتیقه‌ی رصد شده.

از آن‌جایی‌که مطالعات تروخیو و همکاران ۲۰۱۴ و فر-متیو و همکاران ۲۰۱۷ نشان داده‌اند که کهکشان‌های عتیقه، پروفایل چگالی جرمی ستاره‌ای متفاوتی نسبت به کهکشان‌های نوع اولیه‌ی معمولی دارند (برای مثال کهکشان NGC 1277 پروفایل چگال‌تری درون شعاع موثر۱۶ خود دارد)، نویسندگان پروفایل چگالی سطحی کهکشان مدل را با کهکشان‌های عتیقه‌ی رصد شده هم مقایسه کرده‌اند. شکل ۳ نشان می‌دهد که کهکشان مدل پروفایل مشابهی با کهکشان‌های عتیقه دارد. بدین ‌ترتیب نویسندگان ثابت می‌کنند که کهکشانی که در چارچوب MOND شکل گرفته است درواقع یک کهکشان عتیقه هست که مقیاس زمانی ستاره‌زایی کوتاهی دارد.

fig3

شکل ۳. مقایسه‌ی پروفایل چگالی جرم ستاره‌ای کهکشان مدل MOND (آبی) با کهکشان‌های عتیقه‌ی رصد شده.

نتیجه‌گیری آن‌ها این است که در چارچوب MOND فروپاشی ابر گازی غیرچرخان پس از بیگ بنگ موجب شکل‌گیری کهکشان‌هایی با سرعت چرخشی و سرعت پراکندگی بالا، مشابه کهکشان‌های عتیقه‌ی رصد شده می‌شود. بنابراین این کهکشان‌ها مانند کهکشان‌های عتیقه مقیاس زمانی ستاره‌زایی کوتاهی دارند.

چارچوب نظری MOND حتی می‌تواند پدید آمدن سریع اختروش‌ها۱۷ و سیاه‌چاله‌های ابرپرجرم۱۸ را هم توجیه کند؛ بدین صورت که فروپاشی‌اولیه‌ی ابر گازی ابتدا یک خوشه‌ی ستاره‌زا و پرجرم را در مرکز شکل می‌دهد.تابع جرم اولیه‌ی۱۹ این خوشه‌ی ستاره‌زا به گونه‌ای است که ستاره‌های پرجرم زیادی نسبت به ستاره‌های کم‌جرم دارد (به دلیل فلزیت کم و چگالی زیاد) و ممکن است به صورت یک شبه اختروش ظاهر شود (این‌جا، این‌جا و این‌جا بیش‌تر راجع به تابع جرم اولیه بخوانید). ستاره‌های یونیزه‌کننده یک میدان تابشی شبه اختروش به‌وجود می‌آورند که خوشه را از سقوط گاز بیش‌تر محافظت می‌کند. از آن‌جایی‌که خوشه دارای تعداد زیادی ستاره‌ی پرجرم است که به سرعت متحول می‌شوند، پس از ۵۰ میلیون سال ستاره‌ها می‌میرند و آن‌چه باقی می‌ماند جمعیت زیادی از سیاه‌چاله‌ها است. سپس این خوشه از سیاه‌چاله‌ها گاز بیش‌تری را می‌بلعند و منقبض می‌شوند تا زمانی‌که دچار فروپاشی شده و یک سیاه‌چاله‌ی ابرپرچرم را تشکیل می‌دهند. نویسندگان محاسبه کرده‌اند که کل این فرآیند در زمان کمتری نسبت به مقیاس زمانی تشکیل کهکشان طول می‌کشد. بدین ترتیب MOND پدید آمدن سریع اختروش‌ها و سیاه‌چاله‌های ابرپرجرم را توجیه می‌کند.

 

۱. Large Scale Structures
۲. Extended Star Formation History
۳. Two-Phase Galaxy Formation Scenario
۴. Monolithic Collapse of Gas Clouds
۵. Red Nuggets
۶.Accretion
۷. Mergers
۸. Massive Early-Type Galaxies
۹. Nearby Universe
۱۰. Quiescent Galaxies
۱۱. Compact Galaxies
۱۲. Star Formation Timescale
۱۳. Big Bang
۱۴.Velocity Dispersion
۱۵. External Field Effect
۱۶. Effective Radius
۱۷. Quasars
۱۸. Super Massive Blackholes
۱۹. Initial Mass Function

شکل بالای صفحه: سمت راست کهکشان عتیقه‌ی NGC 1277 را در مرکز نشان می‌دهد و سمت چپ منحنی چرخشی کهکشان NGC 1560 را نشان می‌دهد که به خوبی با نظریه‌ی MOND بدون فرض وجود ماده‌ی تاریک بازسازی شده‌است. https://owlcation.com/stem/Theories-on-Dark-Matter-and-Dark-Energy و https://www.esa.int/ESA_Multimedia/Images/2018/03/A_red_metal-rich_relic

عنوان اصلی مقاله: The formation of compact massive relic galaxies in MOND
نویسندگان: Eappen & Kroupa
لینک اصلی مقاله: https://arxiv.org/abs/2402.00103

گردآوری: الهام افتخاری

 

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  • The Sun has reached solar maximum, NASA and NOAA scientists sayKorey Haynes
    In a teleconference Oct. 15, representatives from NASA and the National Oceanic and Atmospheric Administration (NOAA) announced that the Sun has reached the peak level in its current cycle of activity, the 25th for which humans have kept detailed records. The 25th cycle has been far more active than the previous one, especially this year,Continue reading "The Sun has reached solar maximum, NASA and NOAA scientists say" The post The Sun has reached solar maximum, NASA and NOAA scientists say appe
     

The Sun has reached solar maximum, NASA and NOAA scientists say

October 16th 2024 at 6:41 pm

In a teleconference Oct. 15, representatives from NASA and the National Oceanic and Atmospheric Administration (NOAA) announced that the Sun has reached the peak level in its current cycle of activity, the 25th for which humans have kept detailed records. The 25th cycle has been far more active than the previous one, especially this year,Continue reading "The Sun has reached solar maximum, NASA and NOAA scientists say"

The post The Sun has reached solar maximum, NASA and NOAA scientists say appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Tsuchinshan-ATLAS’ anti-tailM
    Chris Schur, taken from Payson, Arizona Bright comets like Tsuchinshan-ATLAS (C/2023 A3) — captured here with an 6-minute exposure on an 8-inch RASA — sometimes develop an anti-tail. This secondary tail appears to protrude forward from the comet’s nucleus in the opposite direction of the “normal” tail. An anti-tail is a perspective effect created whenContinue reading "Tsuchinshan-ATLAS’ anti-tail" The post Tsuchinshan-ATLAS’ anti-tail appeared first on Astronomy Magazine.
     

Tsuchinshan-ATLAS’ anti-tail

By: M
October 16th 2024 at 5:50 pm

Chris Schur, taken from Payson, Arizona Bright comets like Tsuchinshan-ATLAS (C/2023 A3) — captured here with an 6-minute exposure on an 8-inch RASA — sometimes develop an anti-tail. This secondary tail appears to protrude forward from the comet’s nucleus in the opposite direction of the “normal” tail. An anti-tail is a perspective effect created whenContinue reading "Tsuchinshan-ATLAS’ anti-tail"

The post Tsuchinshan-ATLAS’ anti-tail appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Polaris Dawn crew talks mission highlights, next stepsM
    BENTONVILLE, Arkansas — The first private spacewalk, an on-orbit symphonic performance, and nearly 40 scientific research experiments. Those were just a few highlights of September’s Polaris Dawn mission: a five-day, four-person orbital spaceflight purchased from SpaceX and commanded by Jared Isaacman, the billionaire CEO of Shift4 Payments. But Isaacman — now a SpaceX “frequent flier”Continue reading "Polaris Dawn crew talks mission highlights, next steps" The post Polaris Dawn crew talks missi
     

Polaris Dawn crew talks mission highlights, next steps

By: M
October 16th 2024 at 12:32 am

BENTONVILLE, Arkansas — The first private spacewalk, an on-orbit symphonic performance, and nearly 40 scientific research experiments. Those were just a few highlights of September’s Polaris Dawn mission: a five-day, four-person orbital spaceflight purchased from SpaceX and commanded by Jared Isaacman, the billionaire CEO of Shift4 Payments. But Isaacman — now a SpaceX “frequent flier”Continue reading "Polaris Dawn crew talks mission highlights, next steps"

The post Polaris Dawn crew talks mission highlights, next steps appeared first on Astronomy Magazine.

Nuclear rockets could travel to Mars in half the time − but designing the reactors that would power them isn't easy

October 16th 2024 at 12:29 am
Fission technology is well established in power generation and nuclear-powered submarines, and its application to drive or power a rocket could one day give NASA a faster, more powerful alternative to chemically driven rockets.

© NASA

Euclid 'dark universe' telescope reveals 1st breathtaking images from massive 'cosmic atlas' map

October 15th 2024 at 8:49 pm
The "first page" of an incredible cosmic atlas being built by the Euclid Space Telescope has been released. The millions of stars and galaxies represent just 1% of the 3D map the mission will create.

© ESA/Euclid/Euclid Consortium/NASA, CEA Paris-Saclay, image processing by J.-C. Cuillandre, E. Bertin, G. Anselmi CC BY-SA 3.0 IGO

  • ✇Astronomy Magazine
  • Euclid releases stunning first map of the deep skyKorey Haynes
    The Euclid space observatory launched in July 2023, tasked with creating a 3D map of more than a third of the sky, surveying billions of galaxies up to 10 billion light-years away. Today, scientists revealed the first page in its cosmic atlas, a mosaic comprising 208 gigapixels of data revealing billions of galaxies in awesomeContinue reading "Euclid releases stunning first map of the deep sky" The post Euclid releases stunning first map of the deep sky appeared first on Astronomy Magazine.
     

Euclid releases stunning first map of the deep sky

October 15th 2024 at 7:45 pm

The Euclid space observatory launched in July 2023, tasked with creating a 3D map of more than a third of the sky, surveying billions of galaxies up to 10 billion light-years away. Today, scientists revealed the first page in its cosmic atlas, a mosaic comprising 208 gigapixels of data revealing billions of galaxies in awesomeContinue reading "Euclid releases stunning first map of the deep sky"

The post Euclid releases stunning first map of the deep sky appeared first on Astronomy Magazine.

  • ✇American Physical Society
  • Diabolical NanomagnetsCharles Day
    Author(s): Charles DayA quantum degeneracy named after a Chinese yo-yo boosts the magnetization lifetime of a short chain of magnetic iron atoms by a factor of 1000.[Physics 17, s118] Published Tue Oct 15, 2024
     
  • ✇Astronomy Magazine
  • Astronomy’s 14th annual star productsPhil Harrington
    Once again, we’ve scoured the astro-marketplace to find the finest, most practical, and most innovative products for Astronomy magazine’s Star Products, 2024 edition. This collection of 35 items, in no particular order, offers a diverse selection. From tools tailored for visual observing to those crafted for astrophotography, there’s something here for everyone, whether you’re aContinue reading "Astronomy’s 14th annual star products" The post Astronomy’s 14th annual star products appeared first
     

Astronomy’s 14th annual star products

October 15th 2024 at 4:30 pm

Once again, we’ve scoured the astro-marketplace to find the finest, most practical, and most innovative products for Astronomy magazine’s Star Products, 2024 edition. This collection of 35 items, in no particular order, offers a diverse selection. From tools tailored for visual observing to those crafted for astrophotography, there’s something here for everyone, whether you’re aContinue reading "Astronomy’s 14th annual star products"

The post Astronomy’s 14th annual star products appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • SpaceX achieves historic booster catch during Starship testM
    SpaceX’s Starship program—responsible for developing the largest and most powerful rocket ever flown—continues to make history. On Sunday, Starship and the Super Heavy booster lifted off around 8:25 a.m. EST from SpaceX’s Starbase launch pad in Boca Chica, Texas, on the rocket’s fifth suborbital test flight. But rather than splash down in the Gulf ofContinue reading "SpaceX achieves historic booster catch during Starship test" The post SpaceX achieves historic booster catch during Starship test
     

SpaceX achieves historic booster catch during Starship test

By: M
October 15th 2024 at 12:27 am

SpaceX’s Starship program—responsible for developing the largest and most powerful rocket ever flown—continues to make history. On Sunday, Starship and the Super Heavy booster lifted off around 8:25 a.m. EST from SpaceX’s Starbase launch pad in Boca Chica, Texas, on the rocket’s fifth suborbital test flight. But rather than splash down in the Gulf ofContinue reading "SpaceX achieves historic booster catch during Starship test"

The post SpaceX achieves historic booster catch during Starship test appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • The Moon meets Saturn: This Week in Astronomy with Dave EicherDavid J. Eicher
    In this episode, Dave Eicher invites you to observe a close meeting of the Moon and the ringed planet, Saturn. This celestial meet-up will take place on the evening of Oct. 14. You won’t need binoculars or a telescope to view it, although binoculars may give a more pleasing view. Head out an hour afterContinue reading "The Moon meets Saturn: This Week in Astronomy with Dave Eicher" The post The Moon meets Saturn: This Week in Astronomy with Dave Eicher appeared first on Astronomy Magazine.
     

The Moon meets Saturn: This Week in Astronomy with Dave Eicher

October 14th 2024 at 7:14 pm

In this episode, Dave Eicher invites you to observe a close meeting of the Moon and the ringed planet, Saturn. This celestial meet-up will take place on the evening of Oct. 14. You won’t need binoculars or a telescope to view it, although binoculars may give a more pleasing view. Head out an hour afterContinue reading "The Moon meets Saturn: This Week in Astronomy with Dave Eicher"

The post The Moon meets Saturn: This Week in Astronomy with Dave Eicher appeared first on Astronomy Magazine.

Monster black hole is a 'cosmic Michael Myers' killing a star and brutally attacking another

October 14th 2024 at 6:30 pm
NASA's Chandra X-ray space telescope has spotted the cosmic serial killer that, like Michael Myers, is back for a sequel, killing a star and attacking a second star with its remains.

© X-ray: NASA/CXC/Queen's Univ. Belfast/M. Nicholl et al.; Optical/IR: PanSTARRS, NSF/Legacy Survey/SDSS; Illustration: Soheb Mandhai / The Astro Phoenix; Image Processing: NASA/CXC/SAO/N. Wolk

  • ✇Astronomy Magazine
  • An auroral capeM
    Philippe Moussette The aurora dances above the Cap-Rouge trestle bridge in Quebec City the night of Oct. 10/11. The post An auroral cape appeared first on Astronomy Magazine.
     
  • ✇Astronomy Magazine
  • Will my telescope show color when viewing deep-sky objects?Astronomy Staff
    How much color should I be able to see in sky objects through a 10-inch telescope?  Dennis HoltConcordia, Kansas Unfortunately, when you look at distant galaxies and nebulae, you won’t see much color through your telescope. That’s because you’re viewing objects that are too faint to trigger your eyes’ color receptors. This is the sameContinue reading "Will my telescope show color when viewing deep-sky objects?" The post Will my telescope show color when viewing deep-sky objects? appeared first o
     

Will my telescope show color when viewing deep-sky objects?

October 14th 2024 at 5:30 pm

How much color should I be able to see in sky objects through a 10-inch telescope?  Dennis HoltConcordia, Kansas Unfortunately, when you look at distant galaxies and nebulae, you won’t see much color through your telescope. That’s because you’re viewing objects that are too faint to trigger your eyes’ color receptors. This is the sameContinue reading "Will my telescope show color when viewing deep-sky objects?"

The post Will my telescope show color when viewing deep-sky objects? appeared first on Astronomy Magazine.

SpaceX catches giant Starship booster with 'Chopsticks' on historic Flight 5 rocket launch and landing (video)

October 13th 2024 at 4:39 pm
SpaceX launched its enormous Starship rocket for the fifth time ever today (Oct. 13), on a dramatic test flight that featured a mid-air catch of the first-stage Super Heavy booster.

© Sergio Flores/AFP via Getty Images

  • ✇Astronomy Magazine
  • 30 years ago: Magellan Venus mission successfully concludedBen Evans
    The third brightest object in the sky after the Sun and Moon, Venus is known for its opalescent splendor at dawn or dusk. Humans have long been drawn to its exquisite beauty and tied it to goddesses of love — from Inanna of Mesopotamian myth to the Greek Aphrodite and Roman Venus. But Venus isContinue reading "30 years ago: Magellan Venus mission successfully concluded" The post 30 years ago: Magellan Venus mission successfully concluded appeared first on Astronomy Magazine.
     

30 years ago: Magellan Venus mission successfully concluded

By: Ben Evans
October 12th 2024 at 4:30 pm

The third brightest object in the sky after the Sun and Moon, Venus is known for its opalescent splendor at dawn or dusk. Humans have long been drawn to its exquisite beauty and tied it to goddesses of love — from Inanna of Mesopotamian myth to the Greek Aphrodite and Roman Venus. But Venus isContinue reading "30 years ago: Magellan Venus mission successfully concluded"

The post 30 years ago: Magellan Venus mission successfully concluded appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • The best images of the Oct. 10 auroral stormAstronomy Staff
    Solar cycle 25 continues to deliver, with flares and coronal mass ejections delivering repeated auroral storms visible at latitudes much lower than normal. Last night’s geomagnetic storm reached G4 levels — the strongest since the historic G5 storm of May 10/11. This collection of photos includes the best of reader submissions, social media, and our ownContinue reading "The best images of the Oct. 10 auroral storm" The post The best images of the Oct. 10 auroral storm appeared first on Astronomy
     

The best images of the Oct. 10 auroral storm

October 11th 2024 at 10:35 pm

Solar cycle 25 continues to deliver, with flares and coronal mass ejections delivering repeated auroral storms visible at latitudes much lower than normal. Last night’s geomagnetic storm reached G4 levels — the strongest since the historic G5 storm of May 10/11. This collection of photos includes the best of reader submissions, social media, and our ownContinue reading "The best images of the Oct. 10 auroral storm"

The post The best images of the Oct. 10 auroral storm appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • NASA’s Europa Clipper sets sail for JupiterAlison Klesman
    NASA’s newest scientific flagship is on its way to the Jupiter system to explore the icy moon Europa, one of the most compelling worlds in our solar system. The mission lifted off Oct. 14 from Launch Complex 39A at NASA’s Kennedy Space Center in Florida at 12:06 p.m. EDT aboard a SpaceX Falcon Heavy rocket.Continue reading "NASA’s Europa Clipper sets sail for Jupiter" The post NASA’s Europa Clipper sets sail for Jupiter appeared first on Astronomy Magazine.
     

NASA’s Europa Clipper sets sail for Jupiter

October 15th 2024 at 6:13 pm

NASA’s newest scientific flagship is on its way to the Jupiter system to explore the icy moon Europa, one of the most compelling worlds in our solar system. The mission lifted off Oct. 14 from Launch Complex 39A at NASA’s Kennedy Space Center in Florida at 12:06 p.m. EDT aboard a SpaceX Falcon Heavy rocket.Continue reading "NASA’s Europa Clipper sets sail for Jupiter"

The post NASA’s Europa Clipper sets sail for Jupiter appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • How we found Morehouse’s Black Ring: A dark nebula hiding in plain sightStephen James O'Meara
    In the pioneering days of long-exposure astrophotography in the late 19th century, the use of dry plates over wet collodion plates simplified the photographic process. The increased light sensitivity of the emulsion coatings on dry plates allowed for shorter exposure times and produced sharper images of the night sky. In 1881, the French inventors brothersContinue reading "How we found Morehouse’s Black Ring: A dark nebula hiding in plain sight" The post How we found Morehouse’s Black Ring: A da
     

How we found Morehouse’s Black Ring: A dark nebula hiding in plain sight

October 11th 2024 at 4:30 pm

In the pioneering days of long-exposure astrophotography in the late 19th century, the use of dry plates over wet collodion plates simplified the photographic process. The increased light sensitivity of the emulsion coatings on dry plates allowed for shorter exposure times and produced sharper images of the night sky. In 1881, the French inventors brothersContinue reading "How we found Morehouse’s Black Ring: A dark nebula hiding in plain sight"

The post How we found Morehouse’s Black Ring: A dark nebula hiding in plain sight appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • The Sky This Week from October 11 to 18: 2024’s third Super Moon risesAlison Klesman
    Friday, October 11Jupiter, now located in Taurus the Bull, appears in telescopes wreathed by its four largest moons: Io, Europa, Ganymede, and Callisto. At times, those moons pass in front of or behind the planet from our point of view, and tonight you can catch the latter as Europa pops into view after crossing behindContinue reading "The Sky This Week from October 11 to 18: 2024’s third Super Moon rises" The post The Sky This Week from October 11 to 18: 2024’s third Super Moon rises appeared f
     

The Sky This Week from October 11 to 18: 2024’s third Super Moon rises

October 11th 2024 at 8:30 am

Friday, October 11Jupiter, now located in Taurus the Bull, appears in telescopes wreathed by its four largest moons: Io, Europa, Ganymede, and Callisto. At times, those moons pass in front of or behind the planet from our point of view, and tonight you can catch the latter as Europa pops into view after crossing behindContinue reading "The Sky This Week from October 11 to 18: 2024’s third Super Moon rises"

The post The Sky This Week from October 11 to 18: 2024’s third Super Moon rises appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • See a comet in the evening: This Week in Astronomy with Dave EicherDavid J. Eicher
    In this video, Astronomy magazine editor Dave Eicher invites you to observe a comet that’s becoming visible in the evening sky. Starting around October 14, look just to the south of west between 15 and 30 minutes after sunset. The comet will be low, but with each evening that passes, it will be a littleContinue reading "See a comet in the evening: This Week in Astronomy with Dave Eicher" The post See a comet in the evening: This Week in Astronomy with Dave Eicher appeared first on Astronomy Maga
     

See a comet in the evening: This Week in Astronomy with Dave Eicher

October 11th 2024 at 1:46 am

In this video, Astronomy magazine editor Dave Eicher invites you to observe a comet that’s becoming visible in the evening sky. Starting around October 14, look just to the south of west between 15 and 30 minutes after sunset. The comet will be low, but with each evening that passes, it will be a littleContinue reading "See a comet in the evening: This Week in Astronomy with Dave Eicher"

The post See a comet in the evening: This Week in Astronomy with Dave Eicher appeared first on Astronomy Magazine.

Gaia space telescope discovers 55 'runaway' careening away from stellar cluster at 80 times the speed of sound

October 11th 2024 at 1:30 am
Using the Gaia space telescope, astronomers have observed 55 massive stars ejected from their home star cluster in the Large Magellanic Cloud at speeds equivalent to 80 times the speed of sound.

© Danielle Futselaar, James Webb Space Telescope/NIRCam - NASA, ESA, CSA and STScI.

  • ✇Astronomy Magazine
  • Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to lookMichael Bakich
    After putting on a show in the predawn sky earlier this month, Comet Tsuchinshan-ATLAS (C/2023 A3) was eventually lost in the glare of the Sun. But now that it has crossed behind the Sun from our point of view, it is emerging in the early evening sky and becoming more visible every night as itContinue reading "Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to look" The post Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to look appeared first
     

Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to look

October 10th 2024 at 2:30 pm

After putting on a show in the predawn sky earlier this month, Comet Tsuchinshan-ATLAS (C/2023 A3) was eventually lost in the glare of the Sun. But now that it has crossed behind the Sun from our point of view, it is emerging in the early evening sky and becoming more visible every night as itContinue reading "Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to look"

The post Comet Tsuchinshan-ATLAS is rising higher in the evening sky. Here’s where to look appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 levelKorey Haynes
    On Oct. 8, an X-class solar flare gave rise to a coronal mass ejection (CME) that erupted from the surface of the Sun, racing toward Earth at 1.5 million mph (2.4 million km/h). It arrived at Earth at 11:15 a.m. EDT today, Oct. 10. At 12:57 p.m. EDT, the U.S. Space Weather Prediction Center (SWPC)Continue reading "Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 level" The post Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 level appeared first on Astronomy Ma
     

Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 level

October 10th 2024 at 8:55 pm

On Oct. 8, an X-class solar flare gave rise to a coronal mass ejection (CME) that erupted from the surface of the Sun, racing toward Earth at 1.5 million mph (2.4 million km/h). It arrived at Earth at 11:15 a.m. EDT today, Oct. 10. At 12:57 p.m. EDT, the U.S. Space Weather Prediction Center (SWPC)Continue reading "Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 level"

The post Earth sees strong aurorae Oct. 10 as solar storm hits ‘severe’ G4 level appeared first on Astronomy Magazine.

NASA wants to send humans to Mars in the 2030s − a crewed mission could unlock some of the Red Planet’s geologic mysteries

By: shill
October 9th 2024 at 10:40 pm

NASA plans to send humans on a scientific round trip to Mars potentially as early as 2035. The trip will take about six to seven months each way and will cover up to 250 million miles (402 million kilometers) each way. The astronauts may spend as many as 500 days on the planet’s surface beforeContinue reading "NASA wants to send humans to Mars in the 2030s − a crewed mission could unlock some of the Red Planet’s geologic mysteries"

The post NASA wants to send humans to Mars in the 2030s − a crewed mission could unlock some of the Red Planet’s geologic mysteries appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • The hero we deserveM
    Acquired by Mark McComsikey at Observatorio El Sauce, Chile; processed by Ron Brecher The Cosmic Bat Nebula is the 43rd object in Beverly Lynds’ landmark catalog of dark nebulae, which she published in 1962 — the greatest catalog of such objects since E.E. Barnard’s in 1919. Lynds died Oct. 5 at the age of 95.Continue reading "The hero we deserve" The post The hero we deserve appeared first on Astronomy Magazine.
     

The hero we deserve

By: M
October 9th 2024 at 1:30 pm

Acquired by Mark McComsikey at Observatorio El Sauce, Chile; processed by Ron Brecher The Cosmic Bat Nebula is the 43rd object in Beverly Lynds’ landmark catalog of dark nebulae, which she published in 1962 — the greatest catalog of such objects since E.E. Barnard’s in 1919. Lynds died Oct. 5 at the age of 95.Continue reading "The hero we deserve"

The post The hero we deserve appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • The Moon meets Antares: This Week in Astronomy with Dave EicherDavid J. Eicher
    In this episode, Dave Eicher invites you to observe a close meeting of the Moon and the brightest star in the constellation Scorpius the Scorpion, Antares. This celestial meet-up will take place on the evening of October 7. You won’t need binoculars or a telescope to view it, although binoculars may give a more pleasingContinue reading "The Moon meets Antares: This Week in Astronomy with Dave Eicher" The post The Moon meets Antares: This Week in Astronomy with Dave Eicher appeared first on Astro
     

The Moon meets Antares: This Week in Astronomy with Dave Eicher

October 8th 2024 at 9:48 pm

In this episode, Dave Eicher invites you to observe a close meeting of the Moon and the brightest star in the constellation Scorpius the Scorpion, Antares. This celestial meet-up will take place on the evening of October 7. You won’t need binoculars or a telescope to view it, although binoculars may give a more pleasingContinue reading "The Moon meets Antares: This Week in Astronomy with Dave Eicher"

The post The Moon meets Antares: This Week in Astronomy with Dave Eicher appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • ESA’s Hera mission is headed to Dimorphos, the asteroid NASA crashed intoSamantha Hill
    Although the day started out with a few clouds and rain, the European Space Agency’s (ESA) Hera mission successfully launched on Monday at 10:52 a.m. EDT from NASA’s Kennedy Space Center in Florida. Although advance forecasts gave only a 15 percent chance of favorable weather, fears of postponement quickly dissipated as each stage of theContinue reading "ESA’s Hera mission is headed to Dimorphos, the asteroid NASA crashed into" The post ESA’s Hera mission is headed to Dimorphos, the asteroid NAS
     

ESA’s Hera mission is headed to Dimorphos, the asteroid NASA crashed into

October 8th 2024 at 9:18 pm

Although the day started out with a few clouds and rain, the European Space Agency’s (ESA) Hera mission successfully launched on Monday at 10:52 a.m. EDT from NASA’s Kennedy Space Center in Florida. Although advance forecasts gave only a 15 percent chance of favorable weather, fears of postponement quickly dissipated as each stage of theContinue reading "ESA’s Hera mission is headed to Dimorphos, the asteroid NASA crashed into"

The post ESA’s Hera mission is headed to Dimorphos, the asteroid NASA crashed into appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteriesAlison Klesman
    Many large survey experiments in astronomy are looking to understand what we still don’t know about dark energy. Yet, many are plagued with the same problem: too much data.    A tricky problem The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is looking to create one of the largest maps of the universe by creating aContinue reading "Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteries" The post Dark Energy Explorers: How you can help unravel one of the
     

Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteries

October 8th 2024 at 8:00 pm

Many large survey experiments in astronomy are looking to understand what we still don’t know about dark energy. Yet, many are plagued with the same problem: too much data.    A tricky problem The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is looking to create one of the largest maps of the universe by creating aContinue reading "Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteries"

The post Dark Energy Explorers: How you can help unravel one of the universe’s biggest mysteries appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Why Starizona’s Nexus coma corrector wowsChris Schur
    Affordable fast Newtonian astrographs are game changers for astrophotographers. Most of these instruments have a focal ratio in the vicinity of f/4, allowing them to capture light from deep-sky objects more than six times faster than the f/10 Schmidt-Cassegrain telescopes that dominate the market. But with that faster speed comes a huge problem: a curvedContinue reading "Why Starizona’s Nexus coma corrector wows" The post Why Starizona’s Nexus coma corrector wows appeared first on Astronomy Maga
     

Why Starizona’s Nexus coma corrector wows

October 8th 2024 at 4:30 pm

Affordable fast Newtonian astrographs are game changers for astrophotographers. Most of these instruments have a focal ratio in the vicinity of f/4, allowing them to capture light from deep-sky objects more than six times faster than the f/10 Schmidt-Cassegrain telescopes that dominate the market. But with that faster speed comes a huge problem: a curvedContinue reading "Why Starizona’s Nexus coma corrector wows"

The post Why Starizona’s Nexus coma corrector wows appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Europa Clipper launch postponed until at least Oct. 13 due to Hurricane MiltonMark Zastrow
    UPDATE Oct. 10: The Kennedy Space Center remains closed as NASA begins “the assessment and recovery process” from Hurricane Milton, the agency said in a statement today. The statement continued: “The agency’s Europa Clipper launch team will schedule an official launch date when teams from NASA and SpaceX are able to perform their assessments, andContinue reading "Europa Clipper launch postponed until at least Oct. 13 due to Hurricane Milton" The post Europa Clipper launch postponed until at leas
     

Europa Clipper launch postponed until at least Oct. 13 due to Hurricane Milton

October 11th 2024 at 1:03 am

UPDATE Oct. 10: The Kennedy Space Center remains closed as NASA begins “the assessment and recovery process” from Hurricane Milton, the agency said in a statement today. The statement continued: “The agency’s Europa Clipper launch team will schedule an official launch date when teams from NASA and SpaceX are able to perform their assessments, andContinue reading "Europa Clipper launch postponed until at least Oct. 13 due to Hurricane Milton"

The post Europa Clipper launch postponed until at least Oct. 13 due to Hurricane Milton appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • Comet Tsuchinshan-ATLAS will soon move into the evening skyMichael E. Bakich
    Comet Tsuchinshan-ATLAS, also known by its catalog designation C/2023 A3, is now magnitude 2.2 in the morning sky. But if you’re not an early riser, you can soon rejoice — it will become visible in the evening sky starting Oct. 14.  On that date, the comet will be in the far eastern part of theContinue reading "Comet Tsuchinshan-ATLAS will soon move into the evening sky" The post Comet Tsuchinshan-ATLAS will soon move into the evening sky appeared first on Astronomy Magazine.
     

Comet Tsuchinshan-ATLAS will soon move into the evening sky

October 7th 2024 at 8:53 pm

Comet Tsuchinshan-ATLAS, also known by its catalog designation C/2023 A3, is now magnitude 2.2 in the morning sky. But if you’re not an early riser, you can soon rejoice — it will become visible in the evening sky starting Oct. 14.  On that date, the comet will be in the far eastern part of theContinue reading "Comet Tsuchinshan-ATLAS will soon move into the evening sky"

The post Comet Tsuchinshan-ATLAS will soon move into the evening sky appeared first on Astronomy Magazine.

  • ✇Astronomy Magazine
  • An autumn conjunctionM
    Behyar Bakhshandeh from Carlsbad, California The Moon and Venus met in the sky this past weekend, as captured here on Oct. 5 with a Canon DSLR and 300mm f/4 lens. The post An autumn conjunction appeared first on Astronomy Magazine.
     
  • ✇Astronomy Magazine
  • The Best Space Gifts for Astronomy Lovers and Stargazers | Holiday Gift Guide 2024Astronomy Staff
    The holiday season is the best time to deepen your love of the cosmos — or give someone you know a great space-themed gift. But finding the perfect astronomy present is hard. That’s why The Space Store, the online store of Astronomy magazine, curated this list of top-rated astronomy and space-themed gifts for the 2024 Christmas andContinue reading "The Best Space Gifts for Astronomy Lovers and Stargazers | Holiday Gift Guide 2024" The post The Best Space Gifts for Astronomy Lovers and Stargazers
     

The Best Space Gifts for Astronomy Lovers and Stargazers | Holiday Gift Guide 2024

October 7th 2024 at 8:07 pm

The holiday season is the best time to deepen your love of the cosmos — or give someone you know a great space-themed gift. But finding the perfect astronomy present is hard. That’s why The Space Store, the online store of Astronomy magazine, curated this list of top-rated astronomy and space-themed gifts for the 2024 Christmas andContinue reading "The Best Space Gifts for Astronomy Lovers and Stargazers | Holiday Gift Guide 2024"

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  • How long will Saturn’s rings last before they disappear? Astronomy Staff
    Do astronomers have any estimates of when Saturn’s rings will disappear? Doug KaupaCouncil Bluffs, Iowa All four of the solar system’s giant planets have ring systems. The rings of Jupiter, Uranus, and Neptune are dark, sparse belts or ringlets. Only Saturn’s massive main rings are dense and bright, made of almost pure water-ice particles rangingContinue reading "How long will Saturn’s rings last before they disappear? " The post How long will Saturn’s rings last before they disappear?  appeared
     

How long will Saturn’s rings last before they disappear? 

October 7th 2024 at 5:30 pm

Do astronomers have any estimates of when Saturn’s rings will disappear? Doug KaupaCouncil Bluffs, Iowa All four of the solar system’s giant planets have ring systems. The rings of Jupiter, Uranus, and Neptune are dark, sparse belts or ringlets. Only Saturn’s massive main rings are dense and bright, made of almost pure water-ice particles rangingContinue reading "How long will Saturn’s rings last before they disappear? "

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  • Beverly Lynds, creator of landmark catalog of dark nebulae, dies at 95Rod Pommier
    American astronomer Beverly Turner Lynds died peacefully Oct. 5, 2024 at a hospice in Portland, Oregon, after suffering a stroke in early September. She was 95 years old.  Lynds was born Aug. 19, 1929, in Shreveport, Louisiana, but moved to New Orleans at age three. She attended Centenary College in Shreveport and decided she wanted toContinue reading "Beverly Lynds, creator of landmark catalog of dark nebulae, dies at 95" The post Beverly Lynds, creator of landmark catalog of dark nebulae, dies
     

Beverly Lynds, creator of landmark catalog of dark nebulae, dies at 95

October 7th 2024 at 5:11 pm

American astronomer Beverly Turner Lynds died peacefully Oct. 5, 2024 at a hospice in Portland, Oregon, after suffering a stroke in early September. She was 95 years old.  Lynds was born Aug. 19, 1929, in Shreveport, Louisiana, but moved to New Orleans at age three. She attended Centenary College in Shreveport and decided she wanted toContinue reading "Beverly Lynds, creator of landmark catalog of dark nebulae, dies at 95"

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Nuclear rockets could travel to Mars in half the time − but designing the reactors that would power them isn’t easy

By: shill
October 5th 2024 at 4:30 pm

NASA plans to send crewed missions to Mars over the next decade – but the 140 million-mile (225 million-kilometer) journey to the red planet could take several months to years round trip. This relatively long transit time is a result of the use of traditional chemical rocket fuel. An alternative technology to the chemically propelledContinue reading "Nuclear rockets could travel to Mars in half the time − but designing the reactors that would power them isn’t easy"

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  • Hera launches to survey the wreckage of NASA’s asteroid impact testSamantha Hill
    UPDATE Oct. 7: The Hera mission lifted off today, Monday, Oct. 7 at 10:52 a.m. EDT. The launch livestream can be viewed below via the European Space Agency’s YouTube stream or on X via SpaceX’s account. Here’s what to know about the Hera mission. In 2022, NASA’s Double Asteroid Redirection Test (DART) successfully slammed intoContinue reading "Hera launches to survey the wreckage of NASA’s asteroid impact test" The post Hera launches to survey the wreckage of NASA’s asteroid impact test appeared
     

Hera launches to survey the wreckage of NASA’s asteroid impact test

October 7th 2024 at 10:25 am

UPDATE Oct. 7: The Hera mission lifted off today, Monday, Oct. 7 at 10:52 a.m. EDT. The launch livestream can be viewed below via the European Space Agency’s YouTube stream or on X via SpaceX’s account. Here’s what to know about the Hera mission. In 2022, NASA’s Double Asteroid Redirection Test (DART) successfully slammed intoContinue reading "Hera launches to survey the wreckage of NASA’s asteroid impact test"

The post Hera launches to survey the wreckage of NASA’s asteroid impact test appeared first on Astronomy Magazine.

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  • Pastoral perihelionM
    Jean Cursino, taken from Caçapava, São Paulo, Brazil The long tail of Comet Tsuchinshan-ATLAS (C/2023 A3) appears in this 30-second exposure taken at f/2.2 and ISO 250 with a Nikon DSLR and 50mm lens. The post Pastoral perihelion appeared first on Astronomy Magazine.
     
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  • Is AI the key to predicting solar storms?Alison Klesman
    On Sept. 1, 1859, the most intense geomagnetic storm in recorded history paid Earth a visit. This colossal solar outburst, which led to telegraph systems catching fire and aurorae lighting up skies down to the tropics, became known as the Carrington Event, in honor of English amateur astronomer Richard Carrington, who determined that a majorContinue reading "Is AI the key to predicting solar storms?" The post Is AI the key to predicting solar storms? appeared first on Astronomy Magazine.
     

Is AI the key to predicting solar storms?

October 4th 2024 at 7:30 pm

On Sept. 1, 1859, the most intense geomagnetic storm in recorded history paid Earth a visit. This colossal solar outburst, which led to telegraph systems catching fire and aurorae lighting up skies down to the tropics, became known as the Carrington Event, in honor of English amateur astronomer Richard Carrington, who determined that a majorContinue reading "Is AI the key to predicting solar storms?"

The post Is AI the key to predicting solar storms? appeared first on Astronomy Magazine.

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  • Will a new solar flare produce great northern lights?Michael E. Bakich
    Solar flares, powerful bursts of energy from our Sun, can have serious effects here on Earth. Flares and other solar eruptions can affect radio communications, disrupt electric power grids, mess up navigation signals like GPS, and pose risks to spacecraft and any astronauts in them. These effects happen because the ionosphere (Earth’s upper atmosphere, fromContinue reading "Will a new solar flare produce great northern lights?" The post Will a new solar flare produce great northern lights? appea
     

Will a new solar flare produce great northern lights?

October 4th 2024 at 5:31 pm

Solar flares, powerful bursts of energy from our Sun, can have serious effects here on Earth. Flares and other solar eruptions can affect radio communications, disrupt electric power grids, mess up navigation signals like GPS, and pose risks to spacecraft and any astronauts in them. These effects happen because the ionosphere (Earth’s upper atmosphere, fromContinue reading "Will a new solar flare produce great northern lights?"

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  • Observe the galaxies of SculptorMichael Bakich
    The constellation Sculptor is not an easy star pattern to find, but it’s worth the effort because it contains some gorgeous deep-sky objects. Its name comes from French astronomer Nicolas Louis de Lacaille, who surveyed the southern sky from 1750 to 1753 at the Cape of Good Hope. He called the pattern “The Sculptor’s Workshop,”Continue reading "Observe the galaxies of Sculptor" The post Observe the galaxies of Sculptor appeared first on Astronomy Magazine.
     

Observe the galaxies of Sculptor

October 4th 2024 at 4:30 pm

The constellation Sculptor is not an easy star pattern to find, but it’s worth the effort because it contains some gorgeous deep-sky objects. Its name comes from French astronomer Nicolas Louis de Lacaille, who surveyed the southern sky from 1750 to 1753 at the Cape of Good Hope. He called the pattern “The Sculptor’s Workshop,”Continue reading "Observe the galaxies of Sculptor"

The post Observe the galaxies of Sculptor appeared first on Astronomy Magazine.

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  • The Sky This Week from October 4 to 11: Enjoy a First Quarter MoonAlison Klesman
    Friday, October 4Now that autumn is officially upon the Northern Hemisphere, the familiar wintertime constellations are rising earlier each night. One of those constellations is Taurus, now some 30° above the eastern horizon by local midnight.  The brightest star in Taurus is the Bull’s red giant eye, Aldebaran. (Don’t mistake brighter Jupiter, now in easternContinue reading "The Sky This Week from October 4 to 11: Enjoy a First Quarter Moon" The post The Sky This Week from October 4 to 11: Enjo
     

The Sky This Week from October 4 to 11: Enjoy a First Quarter Moon

October 4th 2024 at 8:30 am

Friday, October 4Now that autumn is officially upon the Northern Hemisphere, the familiar wintertime constellations are rising earlier each night. One of those constellations is Taurus, now some 30° above the eastern horizon by local midnight.  The brightest star in Taurus is the Bull’s red giant eye, Aldebaran. (Don’t mistake brighter Jupiter, now in easternContinue reading "The Sky This Week from October 4 to 11: Enjoy a First Quarter Moon"

The post The Sky This Week from October 4 to 11: Enjoy a First Quarter Moon appeared first on Astronomy Magazine.

James Webb Space Telescope finds supernova 'Hope' that could finally resolve major astronomy debate

October 4th 2024 at 12:30 am
The James Webb Space Telescope has observed a distant cosmic explosion that erupted in the early universe called "supernova Hope" that could help resolve lingering "Hubble trouble."

© NASA, ESA, CSA, STScI, B. Frye (University of Arizona), R. Windhorst (Arizona State University), S. Cohen (Arizona State University), J. D’Silva (University of Western Australia, Perth), A. Koekemoer (Space Telescope Science Institute), J. Summers (Arizona State University).

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  • Discovery of a tiny exoplanet sheds new light on a very old starRandall Hyman
    As lone stars go, there’s nothing quite so distinctive as Barnard’s Star. After the Alpha Centauri system, it is our closest neighbor, a red dwarf one-fifth the size of the Sun and 4,500 degrees Fahrenheit (2,500 degrees Celsius) cooler. Just 6 light-years away, it outpaces all other stars by shifting across the night sky byContinue reading "Discovery of a tiny exoplanet sheds new light on a very old star" The post Discovery of a tiny exoplanet sheds new light on a very old star appeared first o
     

Discovery of a tiny exoplanet sheds new light on a very old star

October 4th 2024 at 12:11 am

As lone stars go, there’s nothing quite so distinctive as Barnard’s Star. After the Alpha Centauri system, it is our closest neighbor, a red dwarf one-fifth the size of the Sun and 4,500 degrees Fahrenheit (2,500 degrees Celsius) cooler. Just 6 light-years away, it outpaces all other stars by shifting across the night sky byContinue reading "Discovery of a tiny exoplanet sheds new light on a very old star"

The post Discovery of a tiny exoplanet sheds new light on a very old star appeared first on Astronomy Magazine.

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  • Eclipse success on Easter IslandDavid J. Eicher
    Your editor is in the midst of a weeklong trip to a very remote place. A few days ago I departed Tucson and traveled to Santiago, Chile, where I met about 20 enthusiastic people who were charged up to see the annular eclipse that occurred today. We spent two days touring the marvels of Santiago,Continue reading "Eclipse success on Easter Island" The post Eclipse success on Easter Island appeared first on Astronomy Magazine.
     

Eclipse success on Easter Island

October 3rd 2024 at 6:27 am

Your editor is in the midst of a weeklong trip to a very remote place. A few days ago I departed Tucson and traveled to Santiago, Chile, where I met about 20 enthusiastic people who were charged up to see the annular eclipse that occurred today. We spent two days touring the marvels of Santiago,Continue reading "Eclipse success on Easter Island"

The post Eclipse success on Easter Island appeared first on Astronomy Magazine.

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  • Three wondersM
    Wael Omar, taken from Giza, Egypt Comet Tsuchinshan-ATLAS (C/2023 A3) and a crescent Moon rise over the three main pyramids at Giza in this composite scene. Each layer consists of twenty-five 0.8-second subframes taken with a Sony astromodified mirrorless camera at ISO 800 and an 85mm lens at f/2.8. The post Three wonders appeared first on Astronomy Magazine.
     

Three wonders

By: M
October 2nd 2024 at 8:43 pm

Wael Omar, taken from Giza, Egypt Comet Tsuchinshan-ATLAS (C/2023 A3) and a crescent Moon rise over the three main pyramids at Giza in this composite scene. Each layer consists of twenty-five 0.8-second subframes taken with a Sony astromodified mirrorless camera at ISO 800 and an 85mm lens at f/2.8.

The post Three wonders appeared first on Astronomy Magazine.

'I think it was hard not to watch that rocket lift off without thinking, that's my rocket and that's my crew.' How the NASA astronauts bumped from SpaceX's Crew-9 watched their ride launch without them

NASA astronauts Zena Cardman and Stephanie Wilson were expected to launch on SpaceX's Crew-9 mission on Sept. 28. Still on Earth, they spoke about how they're feeling.

© SpaceX

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