0:00:00.100,0:00:04.100
The 14 moons of Neptune [br]are a strange bunch.

0:00:04.446,0:00:08.446
Most of them are small [br]potato shaped pieces of ice and rock.

0:00:08.559,0:00:14.891
Some are so far away from Neptune that [br]they need 29 years to circle Neptune once.

0:00:14.891,0:00:18.981
Almost all of them are asteroids [br]trapped by Neptune's gravity.

0:00:19.434,0:00:25.234
99.5% of all the mass around Neptune [br]is concentrated in Triton.

0:00:25.518,0:00:30.058
It's the 7th biggest moon, and [br]more massive than all other known moons

0:00:30.058,0:00:33.698
in the solar system that are [br]smaller than itself combined.

0:00:33.698,0:00:38.058
Its surface area is about as big as the [br]mainland of Russia and Australia together.

0:00:38.632,0:00:44.992
Also, Triton is one of only four objects [br]in the solar system that we know is geologically active.

0:00:45.193,0:00:50.233
Triton orbits Neptune in the 'wrong' direction, [br]against the rotation of Neptune,

0:00:50.233,0:00:54.333
which is unique in our solar system[br]for an object as big as Triton.

0:00:54.374,0:00:58.444
We can conclude from this that [br]Triton hasn't always been a moon of Neptune,

0:00:58.444,0:01:02.644
but probably was a dwarf planet that [br]was forced into submission by Neptune,

0:01:02.644,0:01:06.264
when the solar system was younger [br]and more chaotic.

0:01:06.264,0:01:10.824
The most popular theory here is that[br]Triton was once part of a double system,

0:01:10.824,0:01:14.004
when Neptune migrated [br]to the outer edges of the solar system,

0:01:14.004,0:01:18.994
its gravity interfered with the double system[br]and catapulted the other object into space,

0:01:18.994,0:01:21.474
while Triton was forced into orbit.

0:01:21.594,0:01:25.844
This would of disrupted the orbits [br]of other Neptune moons rather violently

0:01:25.844,0:01:28.964
and would most likely have [br]either pushed them away from Neptune,

0:01:28.964,0:01:31.944
or let them collide or crash into Neptune.

0:01:31.944,0:01:36.064
This would explain why Neptune's moons [br]are so dominated by Triton.

0:01:37.004,0:01:39.534
But, this will end one day,

0:01:39.681,0:01:43.011
Triton is being slowed down by Neptune,

0:01:43.011,0:01:43.971
and eventually,

0:01:43.971,0:01:45.381
it will either crash into it,

0:01:45.381,0:01:51.211
or be ground by Neptune's gravity into [br]a huge ring system, similar to Saturn's.

0:01:51.807,0:01:55.067
So, don't by real estate on Triton.

0:01:55.900,0:01:57.350
Fixed English Subtiles by[br]Mads Hagemann Nielsen - 2015