:00:50
[ Man Narrating ]
This is the Earth at a time...
:00:52
when the dinosaurs roamed
a lush and fertile planet.
:01:04
A piece of rock
just six miles wide...
:01:07
changed all that.
:01:17
It hit with the force
of 10,000 nuclear weapons.
:01:23
A trillion tons of dirt and rock
hurtled into the atmosphere,
:01:28
creating a suffocating
blanket of dust...
:01:31
the sun was powerless
to penetrate...
:01:33
for a thousand years.
:01:43
It happened before.
:01:46
It will happen again.
:01:50
It's just a question of when.