Arcsecond size of the Andromeda Galaxy

In summary, the Andromeda galaxy is much wider than the moon, even when taking into account its outer regions. However, the visible-to-naked-eye region still shows a significant portion of its spiral structure. There is a photo that captures 80 arcmin of the galaxy, but it does not cover the entire extent of it. Additionally, there are many other galaxies that are large enough to be seen with the naked eye if they were bright enough.
  • #1
Simfish
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So it's often said that the Andromeda galaxy is much wider than the moon, if you count all of its outer regions as well. Yet, you can clearly see much of the Andromeda's spiral structure in the small region that the visible-to-naked-eye region occupies. So what do the outer regions of it look like? And is there a diagram on a star chart showing how far it stretches?
 
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  • #2
Andromeda is larger than the full moon to the naked eye.
 
  • #3
This photo is 80 arcmin wide and doesn't quite get all of it: http://www.russsscope.net/images/M31-10-20-09.jpg

There are quite a large number of galaxies that are big enough that they'd be resolvable with the naked eye if they were bright enough.
 

What is the arcsecond size of the Andromeda Galaxy?

The arcsecond size of the Andromeda Galaxy is approximately 1780 arcseconds, which is equivalent to 0.49 degrees.

How was the arcsecond size of the Andromeda Galaxy determined?

The arcsecond size of the Andromeda Galaxy was determined through observations using telescopes and other instruments that measure the angular size of objects in the sky.

How does the arcsecond size of the Andromeda Galaxy compare to other galaxies?

The arcsecond size of the Andromeda Galaxy is relatively large compared to other nearby galaxies, such as the Milky Way which has an angular size of only 4.74 arcminutes.

Is the arcsecond size of the Andromeda Galaxy constant?

No, the arcsecond size of the Andromeda Galaxy is not constant as it is affected by factors such as its distance from Earth and its position in the sky.

Why is the arcsecond size of the Andromeda Galaxy important?

The arcsecond size of the Andromeda Galaxy is important for understanding the size and scale of our universe, as well as for studying the structure and evolution of galaxies.

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