Collision Course
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September 12, 2012 The Andromeda galaxy, M31, looms large in this artists' concept of Earth's night skies about 3.75 billion years in the future, with the glowing band of the Milky Way to the right. M31 and the Milky Way are on a collision course, which eventually will cause them to merge to form a giant but rather dull elliptical galaxy. [NASA/ESA/STScI (Z. Levay/R. van der Marel)/T. Hallas/A. Mellinger
