File:M31 (Andromeda Galaxy) (noao-m31fsqblock).jpg

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M31 is the closest spiral galaxy to our own Milky Way. Located 2.3 million light years away one can easily find this in the Andromeda constellation with their naked eye on clear moonless nights.

Summary

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Description
English: M31 is the closest spiral galaxy to our own Milky Way. Located 2.3 million light years away one can easily find this in the Andromeda constellation with their naked eye on clear moonless nights. Historically speaking this galaxy is first mentioned by the Persian astronomer Al Sufi in the year 905 A.D. and can be found on star charts dating back before the invention of the telescope. On clear moonless nights away from city lights and with a pair of quality binoculars this object can be traced out to an angular size of 4 degrees. To give you a comparison the full moon has an angular size of just 1/2 a degree. NOAO has a nice image to demonstrate this angular scale.This image was taken as part of Advanced Observing Program (AOP) program at Kitt Peak Visitor Center during 2014.
Date 19 February 2014, 08:37:00 (upload date)
Source M31 (Andromeda Galaxy)
Author KPNO/NOIRLab/NSF/AURA/Adam Block
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current18:01, 23 October 2023Thumbnail for version as of 18:01, 23 October 20233,676 × 1,336 (1.75 MB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://noirlab.edu/public/media/archives/images/large/noao-m31fsqblock.jpg via Commons:Spacemedia

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