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  • Rights: Alain r, CC BY-SA 2.5 Published 17 September 2009, Updated 5 June 2019 Size: 8.9 MB Referencing Hub media

    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.

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