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Thursday, December 27, 2007

Black Hole-owner of powerful gravitational field

-is a region of space i which the gravitational field is so powerful that nothing
can escape after having fallen past the event horizon
-the name comes from the fact that even electromagnetic radiation (e.g. light) is
unable to escape, rendering the interior invisible
-black holes can be detected if they interact with matter outside the event horizon,
for example by drawing in gas from an orbiting star
-gas spirals inward, heating up to very high temperatures and emitting large
amounts of radiation in the process


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