[Script Info]
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Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.29,0:00:02.75,Default,,0000,0000,0000,,The moons of Mars explained.
Dialogue: 0,0:00:03.50,0:00:06.69,Default,,0000,0000,0000,,Mars has two moons, Phobos and Deimos.
Dialogue: 0,0:00:07.25,0:00:10.45,Default,,0000,0000,0000,,They are really tiny. How tiny?
Dialogue: 0,0:00:11.02,0:00:13.07,Default,,0000,0000,0000,,Compared to Mars or our own Moon,
Dialogue: 0,0:00:13.58,0:00:14.37,Default,,0000,0000,0000,,pretty tiny.
Dialogue: 0,0:00:15.20,0:00:17.96,Default,,0000,0000,0000,,Although ‘tiny’ is a matter of opinion.
Dialogue: 0,0:00:19.01,0:00:22.15,Default,,0000,0000,0000,,Their surface area is up close to some\Nof the smallest states on Earth,
Dialogue: 0,0:00:22.15,0:00:23.99,Default,,0000,0000,0000,,like Luxembourg and Malta.
Dialogue: 0,0:00:24.67,0:00:28.00,Default,,0000,0000,0000,,Although Phobos and Deimos are\Nin no way lightweight,
Dialogue: 0,0:00:28.00,0:00:31.06,Default,,0000,0000,0000,,in reality, their gravitational pull\Nisn’t even strong enough
Dialogue: 0,0:00:31.06,0:00:32.73,Default,,0000,0000,0000,,to bring them into spherical form.
Dialogue: 0,0:00:33.00,0:00:36.03,Default,,0000,0000,0000,,So they look more like huge\Npotatoes than moons.
Dialogue: 0,0:00:37.04,0:00:39.16,Default,,0000,0000,0000,,The most popular theory of their origin
Dialogue: 0,0:00:39.16,0:00:41.81,Default,,0000,0000,0000,,is that they were once\Npart of the asteroid belt,
Dialogue: 0,0:00:41.81,0:00:45.43,Default,,0000,0000,0000,,until Jupiter’s massive gravity\Nkicked them out of it,
Dialogue: 0,0:00:45.43,0:00:47.49,Default,,0000,0000,0000,,so Mars could catch them.
Dialogue: 0,0:00:49.57,0:00:56.04,Default,,0000,0000,0000,,Phobos orbits Mars at a average distance\Nof 9,400 kilometres, once every 7½ hours.
Dialogue: 0,0:00:56.53,0:01:00.71,Default,,0000,0000,0000,,It’s on a collision course, and gets\N2 metres closer to Mars every year.
Dialogue: 0,0:01:01.37,0:01:07.26,Default,,0000,0000,0000,,In 50 to 100 million years, it will either\Nbe ripped to pieces by Mars’s gravity
Dialogue: 0,0:01:07.26,0:01:10.27,Default,,0000,0000,0000,,and be transformed into a beautiful ring,
Dialogue: 0,0:01:10.27,0:01:12.47,Default,,0000,0000,0000,,or it will crash into Mars.
Dialogue: 0,0:01:12.83,0:01:16.57,Default,,0000,0000,0000,,The energy released in this collision\Nwould kill everything on the small planet.
Dialogue: 0,0:01:16.85,0:01:22.07,Default,,0000,0000,0000,,So, if there are humans on Mars by then,\Nthey should build very strong bunkers.
Dialogue: 0,0:01:22.70,0:01:26.42,Default,,0000,0000,0000,,Smaller Deimos, on the other\Nhand, is slowly escaping Mars.
Dialogue: 0,0:01:26.73,0:01:31.74,Default,,0000,0000,0000,,Eventually, it will fly off into space\Nand leave a lonely red planet behind.
Dialogue: 0,0:01:32.47,0:01:37.20,Default,,0000,0000,0000,,So, in a few hundred million years,\NMars will be moonless and on its own.
Dialogue: 0,0:01:38.01,0:01:41.66,Default,,0000,0000,0000,,Unless it manages to catch\Nitself another asteroid.