Black holes could be a key to understanding the universe, but they remain shrouded in mystery. So what are black holes—and how do scientists detect them?

00:00 - The mystery of black holes
00:39 - What is a black hole?
01:54 - What are the different types of black holes?
03:12 - Can anything escape a black hole?
04:52 - How do scientists detect black holes?
06:27 - How did scientists create a real image of a black hole?
07:35 - Why black holes appear to defy physics
08:57 - Why are black holes important?

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