Photo: Colossal Four-Galaxy Collision Discovered

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An artist's rendering shows what the night sky might look like from a hypothetical planet near the ongoing four-way collision recently observed by NASA's Spitzer Space Telescope.

Scientists say the collision is one of the biggest ever observed and will eventually form a new galaxy ten times the size of the Milky Way.

Illustration courtesy NASA/JPL-Caltech/Harvard-Smithsonian CfA

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