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How does a rocket speed up and slow down in space?
On Earth, air creates drag to slow you down, but there is no air in space, so you don't get drag at all.
This is great when you want to speed up: use a thruster, point yourself in the right direction, and push using a rocket engine. You will keep that velocity until you want to brake. Then you have to apply the opposite force, so you need to fire thrusters in the other direction.