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Black holes are very small but they can pull in anything that comes too close.

Scientists know black holes are there because they can measure radiation given off when something falls into a black hole.

Black holes cannot be seen directly.

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Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

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Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

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