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Iras Infrared Image Of The Andromeda
NASA / Science Source
Photograph - Photograph
Infrared image of the Andromeda Galaxy (M31) recorded by the Infrared Astronomical Satellite (IRAS). Located at a distance of 2.2 million light years, M31 is the closest major galaxy to our own Milky Way. It is a member of our Local Group of galaxies, which occupies a region of space nearly five million light years across. The existence of M31 was realized in 964 A.D. by the Persian Astronomer Al-Sufi, who recorded it as a 'little cloud'; its nature as a galaxy was not defined until this century. The Andromeda Galaxy's diameter is almost 150,000 light years, and it contains approximately 300,000 million stars.
February 19th, 2013
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