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how are black holes detected. They don't emit light and so spectroscopy can't be used. Then how are they detected.

Asked by 29th December 2011, 9:37 PM
Answered by Expert
Black holes are detected as surrounding material (like gas) is funnelled by the force of gravity into a disc around the black hole. The gas molecules in the disc swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth.
Answered by Expert 29th December 2011, 10:48 PM
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