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Astronomy Picture of the Day - NGC 4449: Small Galaxy, Big Impact
NASA ^ | 11 Nov. 2026 | Credit: NASA, ESA, A. Aloisi (STScI/ESA), and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaborat

Posted on 11/11/2026 11:33:47 AM PST by MtnClimber

Explanation: Don’t judge a galaxy by its size. Our home galaxy, the Milky Way, is about 100,000 light years across. This huge expanse of space contains hundreds of billions of stars! The smallest galaxies, called dwarf galaxies, are about 1/10th the size of the Milky Way and only contain a few billion stars. They are also the most common type of galaxy in the whole universe. Today’s image shows one such dwarf galaxy, NGC 4449, captured by the Hubble Space Telescope. NGC 4449 and similar dwarf galaxies are missing more oxygen than models predict. This suggests their stellar winds and supernovae are surprisingly effective at blowing away oxygen and other heavy elements. Turns out these tiny galaxies may play a big role in spreading heavy elements — the building blocks of stars, planets, and life — throughout the universe!


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; nasa
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1 posted on 11/11/2026 11:33:47 AM PST by MtnClimber
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2 posted on 11/11/2026 11:34:15 AM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: 21stCenturion; 21twelve; 31R1O; 4everontheRight; A Navy Vet; A_perfect_lady; abb; AFB-XYZ; ...
Pinging the APOD list

🪐 🌟 🌌 🍔

3 posted on 11/11/2026 11:35:03 AM PST by MtnClimber (For photos of scenery, wildlife and climbing, click on my screen name for my FR home page.)
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To: MtnClimber

Great background image for my computer.


4 posted on 11/11/2026 12:13:18 PM PST by SkyDancer ( ~ Am Yisrael Chai ~)
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To: MtnClimber

Wow.


5 posted on 11/11/2026 12:17:15 PM PST by No name given ( Anonymous is who you’ll know me as )
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To: SkyDancer

Well said.


6 posted on 11/11/2026 12:18:15 PM PST by No name given ( Anonymous is who you’ll know me as )
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To: MtnClimber

must be pretty boring there... there is only 2 colors in their light spectrum. Pink and blue...


7 posted on 11/11/2026 12:32:11 PM PST by sit-rep (I may be Dumb, but I'm not Stupid!)
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To: MtnClimber
A small galaxy has "only a few billion stars." As if a billion is a small number.

Some estimates are up to a trillion galaxies in the universe but I don't know what the median size of a galaxy is. Has anyone tried to estimate how many stars there are in the universe? Probably some multiple of a septillion.

8 posted on 11/11/2026 1:19:05 PM PST by Verginius Rufus
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To: sit-rep

It’s a binary galaxy. The pink stars are girls and the blue stars are boys.


9 posted on 11/11/2026 1:20:29 PM PST by Verginius Rufus
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