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Astronomy Picture of the Day - Messier 33: The Triangulum Galaxy
NASA ^ | 18 Sep, 2026 | Image Credit & Copyright: George Chatzifrantzis

Posted on 09/18/2026 11:45:11 AM PDT by MtnClimber

Explanation: The small, northern constellation Triangulum harbors this magnificent face-on spiral galaxy, Messier 33. Its popular names include the Pinwheel Galaxy or just the Triangulum Galaxy. M33 is over 50,000 light-years in diameter, third largest in the Local Group of galaxies after the Andromeda Galaxy (M31), and our own Milky Way. About 3 million light-years from the Milky Way, M33 is itself thought to be a satellite of the Andromeda Galaxy and astronomers in these two galaxies would likely have spectacular views of each other's grand spiral star systems. As for the view from the Milky Way, this sharp telescopic image shows off M33's blue star clusters and pinkish star forming regions along the galaxy's loosely wound spiral arms. In fact, the cavernous NGC 604 is the brightest star forming region, seen here at about the 5 o'clock position from the galaxy center. Like M31, M33's population of well-measured variable stars have helped make this nearby spiral a cosmic yardstick for establishing the distance scale of the Universe.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; nasa
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For more detail go to the link and click on the image for a high definition image. You can then move the magnifying glass cursor then click to zoom in and click again to zoom out. When zoomed in you can scan by moving the side bars on the bottom and right side of the image.

1 posted on 09/18/2026 11:45:11 AM PDT by MtnClimber
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To: MtnClimber

2 posted on 09/18/2026 11:45:30 AM PDT 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 09/18/2026 11:46:13 AM PDT 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

There is much awesomeness out there.


4 posted on 09/18/2026 11:49:19 AM PDT by ComputerGuy
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To: MtnClimber

I can see Uncle Zlort’s house!


5 posted on 09/18/2026 11:50:19 AM PDT by Army Air Corps (Four Fried Chickens and a Coke)
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To: MtnClimber

Wow.


6 posted on 09/18/2026 11:58:19 AM PDT by No name given ( Anonymous is who you’ll know me as )
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To: ComputerGuy

That’s the truth.


7 posted on 09/18/2026 11:58:28 AM PDT by No name given ( Anonymous is who you’ll know me as )
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To: MtnClimber

This is the closest large galaxy to us. Closer then the Andromeda galaxy.
It could be seen by naked eye under very good observing conditions, but it is actually quite hard to locate even with scope.
Since it is close and face on, it covers very large area of the sky, so scopes often just look through it without noticing it.


8 posted on 09/18/2026 12:04:17 PM PDT by AZJeep (sane )
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To: MtnClimber

The scale is beyond comprehension.


9 posted on 09/18/2026 12:32:23 PM PDT by NavyShoe
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To: MtnClimber

Cool stuff. Thanks.


10 posted on 09/18/2026 12:52:46 PM PDT by SkyDancer ( ~ Am Yisrael Chai ~)
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To: MtnClimber

At one time, I was so fascinated by the universe that I wanted to be an astronomer. Then, someone discovered that the universe was continually expanding and when I asked: “Expanding into what?”, no one had an answer. That’s when I switched to economics.


11 posted on 09/18/2026 12:59:25 PM PDT by econjack
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To: MtnClimber

I don’t see the triangulum! (LOL)


12 posted on 09/18/2026 1:16:33 PM PDT by MortMan (Americans are increasingly isolated by their connectivity.)
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To: SkyDancer

I second that.


13 posted on 09/18/2026 1:41:14 PM PDT by No name given ( Anonymous is who you’ll know me as )
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