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| A spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew |
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| a device that expels gas in one direction to move in the opposite direction |
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| a spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose. |
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| A large artifical satellite on which people can live and work for long periods |
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| The reaction force that propels a rocket forward |
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| The velocity a rocket must achieve to establish an orbit around a body in space |
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