Rights: Alain r - Own work, CC BY-SA 2.5 Published 17 September 2009 Size: 2.9 MB

Black holes are all that remain after stars with masses over 3 times that of the sun supernova. A black hole is a massive object (or region) in space that is so dense that, within a certain radius (the Schwarzschild radius determines the event horizon), its gravitational field does not let anything escape from it – not even light.

Acknowledgement: Alain r - Own work, CC BY-SA 2.5