Credit & Copyright: Robert Gendler
(robgendlerastropics.com)
Explanation:
Andromeda is the nearest major galaxy to our own Milky Way Galaxy. Our Galaxy
is thought to look much like Andromeda. Together these two galaxies dominate
the Local Group of galaxies. The diffuse light from Andromeda is caused by the
hundreds of billions of stars that compose it. The several distinct stars that
surround Andromeda's image are actually stars in our Galaxy that are well in
front of the background object. Andromeda is frequently referred to as M31
since it is the 31st object on Messier's list of diffuse sky objects. M31 is so
distant it takes about two million years for light to reach us from there.
Although visible without aid, the above image of M31 is a digital mosaic of 20
frames taken with a small telescope. Much about M31 remains unknown, including
how it acquired its unusual double-peaked center.
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