1
00:00:00,934 --> 00:00:03,603
Thrusters use conservation of momentum.

2
00:00:03,870 --> 00:00:09,242
Ignited fuel creates expanding gas
which exits the engines in one direction

3
00:00:09,509 --> 00:00:12,145
and the observatory moves
in the opposite direction.

4
00:00:13,546 --> 00:00:16,783
So right now we're looking
at the propulsion system for the Roman

5
00:00:16,783 --> 00:00:17,984
Space Telescope.

6
00:00:17,984 --> 00:00:21,421
Today we put our last tank
on the propulsion support frame.

7
00:00:21,588 --> 00:00:25,191
The propulsion support frame is the frame that's supporting everything.

8
00:00:26,493 --> 00:00:29,629
The thrusters are so efficient
in the vacuum of space

9
00:00:29,929 --> 00:00:32,799
that they can be surprisingly small to move

10
00:00:32,799 --> 00:00:35,268
the 18,000 lbs spacecraft.

11
00:00:36,603 --> 00:00:38,605
This is all it needs.