this post was submitted on 06 Dec 2023
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What if we aimed the Hubble Telescope at Earth? - Minute Earth are working together with xkcd to animate "What If" questions! (www.youtube.com)
submitted 11 months ago by [email protected] to c/[email protected]
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[โ€“] [email protected] 3 points 11 months ago (1 children)

And the angular momentum is conserved.

Your choices are basically RCS thrusters or reaction wheels. Thrusters burn limited fuel. Reaction wheels are flywheels inside the satellite that you spin in the operator opposite direction to where you want to rotate. They are limited by the mass and size of flywheel, and the maximum speed you can spin it up to.

[โ€“] [email protected] 1 points 11 months ago

electromagnets also work as the earth has a magnetic field. a pair of reaction wheels can be rotated (which yes, adds complexity) opposite directions along an axis perpendicular to the axles once they have reached saturation, effectively resetting the reaction wheels