The Andromeda Galaxy, about two and a half million light years away, is the most distant object that can be seen with the unaided eye. The evening hours of late fall offer prime viewing opportunities for locating both the galaxy and the constellation with which it is identified.
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A series of increasingly close-up images: The entire Andromeda Galaxy, also known as M31 (Left); a ground-based telescopic image of the Andromeda Galaxy's central bulge (center); and a Hubble Space Telescope image of Andromeda's galactic nucleus showing two separate light peaks. (Image from News Release STScI-1993-18, courtesy NASA)