PHOTOS: The Best of Hubble
NASA's Hubble space telescope captured the Ring Nebula's shape.
Final Frontier: Space Pictures From Far Reaches of the Universe
Astronomers have found one of the largest objects in the universe, a galaxy cluster where stars are forming more rapidly than anywhere else yet observed. It is called the Phoenix cluster, 5.7 billion light years away in the southern sky. It is seen in this artist's conception. (M. Weiss/CXC/NASA)
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