WEBVTT 00:01.133 --> 00:02.633 align:left position:30% line:83% size:60% black holes are regions in space where 00:02.633 --> 00:04.366 align:left position:30% line:83% size:60% gravity is so incredibly strong that 00:04.366 --> 00:07.066 align:left position:30% line:83% size:60% nothing not even light can escape to 00:07.066 --> 00:08.600 align:left position:20% line:83% size:70% understand why black holes exist though 00:08.600 --> 00:10.700 align:left position:20% line:83% size:70% we need to explore the life cycle of 00:10.700 --> 00:14.066 align:left position:20% line:83% size:70% stars you see stars are born from vast 00:14.066 --> 00:16.333 align:left position:20% line:83% size:70% clouds of gas and dust over millions of 00:16.333 --> 00:18.266 align:left position:20% line:83% size:70% years gravity causes these clouds to 00:18.266 --> 00:20.700 align:left position:20% line:83% size:70% collapse and form a dense core known as 00:20.700 --> 00:23.500 align:left position:20% line:83% size:70% a protostar basically a young Star as a 00:23.500 --> 00:25.433 align:left position:20% line:83% size:70% Proto star continues to gather Mass the 00:25.433 --> 00:27.433 align:left position:30% line:83% size:60% core temperature will rise until it 00:27.433 --> 00:29.366 align:left position:20% line:83% size:70% becomes hot enough to ignite nuclear 00:29.366 --> 00:32.166 align:left position:10% line:89% size:80% fusion this process releases an 00:32.166 --> 00:34.300 align:left position:20% line:83% size:70% incredible amount of energy which allows 00:34.300 --> 00:37.466 align:left position:30% line:83% size:60% stars to shine brightly however when a 00:37.466 --> 00:40.333 align:left position:20% line:83% size:70% massive star then exhausts that nuclear 00:40.333 --> 00:42.600 align:left position:20% line:83% size:70% energy and has no more fuel a big event 00:42.600 --> 00:44.700 align:left position:20% line:83% size:70% known as a supernova can occur during a 00:44.700 --> 00:47.133 align:left position:20% line:83% size:70% supernova explosion the Stars outer 00:47.133 --> 00:49.533 align:left position:20% line:83% size:70% layers are blasted into space leaving 00:49.533 --> 00:52.500 align:left position:20% line:83% size:70% behind a dense core for stars massive 00:52.500 --> 00:57.400 align:left position:20% line:83% size:70% enough that core can become a black hole