<human>:  I'm trying to get a better understanding of the concept of black holes. Can you explain it to me?
<bot>: Black holes are regions of space-time with such strong gravitational pull that nothing, not even light, can escape from it. The gravity is caused by an incredibly dense core
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 • called a singularity
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 • which is the remnant of a collapsed star. There's still much about black holes that has yet to be understood, including how their immense gravity affects surrounding matter and what happens inside them.