This image provided by NASA from the Spitzer space telescope shows a pair of colliding galaxies called NGC 6240 in a rare, short-lived phase of their evolution just before they merge into a single, larger galaxy. The prolonged, violent collision has drastically altered the appearance of both galaxies and created huge amounts of heat -- turning NGC 6240 into an 'infrared luminous' active galaxy. This image was created from combined data from the infrared array camera of NASA's Spitzer Space Telescope.(AP Photo/NASA/JPL )
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