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Object: Andromeda Galaxy • M31 Distance from Earth: 2.5 million light-years Size: 260,000 light-years across Telescope: Spitzer Space Telescope Light: Infrared (blue 3.67μm, red 8.0μm) Description: Persian astronomer Abd al-Rahman al-Sufi made the earliest recorded observation of the Andromeda Galaxy in ad 964. Along with our Milky Way, this galaxy belongs to a group of galaxies known as the Local Group. Andromeda contains over one trillion stars— about three times the Milky Way’s 200–400 billion stars. But watch out! Astronomers predict that the two galaxies could collide several billion years from now. Credit: NASA/JPL-Caltech/P. Barmby (Harvard-Smithsonian CfA)