[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:24.04,0:00:31.52,Default,,0000,0000,0000,,Near a black hole space and time do some very strange things because the black holes are probably the most
Dialogue: 0,0:00:31.52,0:00:39.68,Default,,0000,0000,0000,,violent places we know of in the universe. This river provides a beautiful analogy of what happens
Dialogue: 0,0:00:39.68,0:00:43.08,Default,,0000,0000,0000,,to space and time as you get closer and closer to the black hole.
Dialogue: 0,0:00:47.33,0:00:51.69,Default,,0000,0000,0000,,Now upstream the water is flowing pretty slowly.
Dialogue: 0,0:00:51.69,0:00:55.04,Default,,0000,0000,0000,,Let's imagine it is flowing at three kilometers per hour
Dialogue: 0,0:00:55.04,0:01:01.48,Default,,0000,0000,0000,,and I can swim at 4, so I can swim faster than the flow and can easily escape
Dialogue: 0,0:01:16.16,0:01:19.36,Default,,0000,0000,0000,,But as you go further, further down the stream towards
Dialogue: 0,0:01:19.36,0:01:24.60,Default,,0000,0000,0000,,the waterfall in the distance, the river flows faster and faster.
Dialogue: 0,0:01:43.18,0:01:49.64,Default,,0000,0000,0000,,Imagine that I decided to jump in the river just there at the edge of the falls
Dialogue: 0,0:01:49.64,0:01:52.80,Default,,0000,0000,0000,,The water is flowing far faster than I could swim.
Dialogue: 0,0:01:52.80,0:01:57.06,Default,,0000,0000,0000,,So, no matter what I did, no matter how hard I tried
Dialogue: 0,0:01:57.06,0:01:59.79,Default,,0000,0000,0000,,I would not be able to swim back upstream
Dialogue: 0,0:01:59.79,0:02:05.36,Default,,0000,0000,0000,,I would be carried inextrably towards the edge and I would vanish over the falls
Dialogue: 0,0:02:20.92,0:02:24.23,Default,,0000,0000,0000,,Well, it's the same close to the black hole,
Dialogue: 0,0:02:24.23,0:02:28.65,Default,,0000,0000,0000,,because the space flows faster, faster and faster
Dialogue: 0,0:02:28.65,0:02:30.32,Default,,0000,0000,0000,,towards the black hole.
Dialogue: 0,0:02:30.32,0:02:36.28,Default,,0000,0000,0000,,Literally, this stuff, my space that I am in, flowing over the edge into the black hole.
Dialogue: 0,0:02:36.28,0:02:42.60,Default,,0000,0000,0000,,And then, a very special point, called an event horizon, the space is flowing
Dialogue: 0,0:02:42.60,0:02:46.24,Default,,0000,0000,0000,,at the speed of light into the black hole.
Dialogue: 0,0:02:50.38,0:02:57.64,Default,,0000,0000,0000,,Light itself, travelling at 3000km per second is not going fast enough to escape the flow
Dialogue: 0,0:02:57.64,0:03:01.28,Default,,0000,0000,0000,,and light itself will plunge into the black hole.
Dialogue: 0,0:03:16.27,0:03:23.08,Default,,0000,0000,0000,,Well, as you fall into the black hole, across the event horizon, then if you were going feet first, your feet will be
Dialogue: 0,0:03:23.08,0:03:27.84,Default,,0000,0000,0000,,accelerating faster than your head, so you'll be stretched
Dialogue: 0,0:03:27.84,0:03:31.21,Default,,0000,0000,0000,,and you'll be quite literally spaghettified
Dialogue: 0,0:03:37.84,0:03:40.97,Default,,0000,0000,0000,,Now as you get right into the center,
Dialogue: 0,0:03:40.97,0:03:43.92,Default,,0000,0000,0000,,Then our understanding of physics breaks down.
Dialogue: 0,0:03:43.92,0:03:47.76,Default,,0000,0000,0000,,Our best theory of space and time, Einstein's theory of general relativity
Dialogue: 0,0:03:47.76,0:03:51.72,Default,,0000,0000,0000,,says that space and time become infinitely curved, that
Dialogue: 0,0:03:51.72,0:03:56.44,Default,,0000,0000,0000,,the center of the hole becomes infinitely dense
Dialogue: 0,0:03:56.44,0:04:00.32,Default,,0000,0000,0000,,That place is called the singularity and it is the place
Dialogue: 0,0:04:00.32,0:04:06.12,Default,,0000,0000,0000,,where our understanding of the Universe stops.