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Galactic collision in night sky, artwork
Galactic collision in night sky, artwork. This galactic collision, one of the biggest ever seen, consists of the merger of four large galaxies. It is taking place in the CL0958+4702 galaxy cluster, some 5 billion light years from Earth, in the constellation Ursa Major. The cloud around the galaxies consists of billions of stars being ejected during the collision. The collision is being observed in visible light from ground-based telescopes, and in infrared from orbit with the Spitzer Space Telescope (SST).
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