If a red giant is more than thirty times the mass of the Sun, its core will survive a supernova and will end up as a black hole. These stars have such high gravity that, when their cores collapse, they get compressed into a single point called a singularity. The gravity of a singularity is so strong that nothing at close range can escape - not even light! Everything, it seems, is sucked in and destroyed. Super-massive black holes have been found the centre of every surveyed galaxy* - including our own! But fortunately for us, we are 20,000 light years* from our galaxy's centre, so the black hole's gravity is no threat to us.
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