WEBVTT FILE

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Thrusters use conservation of momentum.

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Ignited fuel creates expanding gas
which exits the engines in one direction

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and the observatory moves
in the opposite direction.

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So right now we're looking
at the propulsion system for the Roman

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Space Telescope.

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Today we put our last tank
on the propulsion support frame.

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The propulsion support frame is the framethat's supporting everything.

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The thrusters are so efficient
in the vacuum of space

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that they can be surprisingly small to move

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the 18,000 lbs spacecraft.

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This is all it needs.

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music.