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If a spacecraft is travelling at a rapid speed between 2 objects in space, and a smaller vehicle exits the spacecraft without being connected, how does the small vehicle stay at the same speed as its ‘parent’ spacecraft?

I’m reading 2001: A Space Odyssey and a pod has exited Discovery while it travels between Jupiter and Saturn.

The pod would have to travel as fast as Discovery? But according to the book it only has enough acceleration to “hover on the moon”.

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