Hubble Spots Ghosts Of Quasars Past

April 3, 2015 12:12 AM

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Glowing green filaments of gas surrounding distant galaxies are evidence of powerful "ghost" quasars that have long since gone invisible, astronomers say. Hubble images give us a look deep into the cosmic past, they say.(Photo : NASA, ESA, and W. Keel (University of Alabama, Tuscaloosa))

Glowing green filaments of gas surrounding distant galaxies are evidence of powerful "ghost" quasars that have long since gone invisible, astronomers say. Hubble images give us a look deep into the cosmic past, they say.

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