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Showing posts with label astronomy. Show all posts
Showing posts with label astronomy. Show all posts

Monday, November 2, 2009

Photograph of the night: A quasar at the center of a galaxy cluster

galaxy cluster called SDSS J1004+4112

Bright at the center of this Hubble Space Telescope (HST) photograph of galaxy cluster SDSS J1004+4112, is a quasar. The gravity lens create by the cluster warps and magnifies the quasar's light. The quasar was the first discovered to be multiply-image lensed by the gravity of a galaxy cluster.