The Andromeda Galaxy, M31, is in the east-northeast at nightfall. Under dark skies, it’s visible to the eye alone from 2.5 million light-years away. A century ago, Edwin Hubble confirmed its nature as a galaxy far outside the Milky Way.
The Andromeda Galaxy, M31, is in the east-northeast at nightfall. Under dark skies, it’s visible to the eye alone from 2.5 million light-years away. A century ago, Edwin Hubble confirmed its nature as a galaxy far outside the Milky Way.