photo: Galaxy Cluster SDSS J1004+4112
NASA's Hubble Space Telescope has captured the first-ever picture of a group of five star-like images of a single distant quasar.
The multiple-image effect seen in the Hubble picture is produced by a process called gravitational lensing, in which the gravitational field of a massive object — in this case, a cluster of galaxies — bends and amplifies light from an object — in this case, a quasar — farther behind it.
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