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Q&A Gravitational slingshots: could they be used to decelerate a spacecraft traveling at a small fraction of light speed?

I have heard of gravitational slingshots being used to theoretically accelerate a spacecraft using a planet's gravity and momentum in orbit. But how about decelerating a ship? If it is at all possi...

8 answers  ·  posted 8y ago by Brian‭  ·  last activity 7y ago by Brian‭

Question space travel reality-check physics space-travel science-fiction