![View of a black hole in front of the Large Magellanic Cloud.](http://static.sciencelearn.org.nz/images/images/000/003/258/full/BH_LMC.png?1674170390)
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.