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English: Astronomers found that Hanny's Voorwerp is the only visible part of a 300,000-light-year-long gaseous streamer stretching around the galaxy. The greenish Voorwerp is visible because a searchlight beam of light from the galaxy's core illuminated it. This beam came from a quasar, a bright, energetic object that is powered by a black hole. An encounter with another galaxy may have fed the black hole and pulled the gaseous streamer from IC 2497.
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Ffynhonnell Hubble Zooms in on a Space Oddity
Awdur NASA, ESA, and A. Feild (STScI)

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10 Ionawr 2011

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cyfredol16:14, 12 Ionawr 2011Bawdlun y fersiwn am 16:14, 12 Ionawr 20112,400 × 1,250 (1,007 KB)Mu301{{Information |Description={{en|1=Astronomers found that Hanny's Voorwerp is the only visible part of a 300-light-year-long gaseous streamer stretching around the galaxy. The greenish Voorwerp is visible because a searchlight beam of light from the galaxy

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