Andromeda Galaxy
oxford
views 1,801,003 updated May 23 2018Andromeda Galaxy Spiral galaxy 2.2 million light-years away in the constellation Andromeda, the most distant object visible to the naked eye. The Andromeda Galaxy has a mass of more than 300,000 million Suns. Its diameter is c.150,000 light-years, somewhat larger than our own Galaxy.
World Encyclopedia