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| a device that expels gas in one direction to move in the opposite direction |
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| the reaction force that propels a rocket forward |
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| speed in a given direction |
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| the velocity a rocket must achieve to establish an orbit around a body in space |
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| the velocity an object must reach to fly beyond a planet’s or moon’s gravitational pull |
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| an object that revolves around another object in space |
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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 artificial satellite on which people can live and work for long periods |
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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 small robotic space probe that can move about the surface of a planet or moon |
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the collection of information about Earth and other objects in space
using satellites or probes |
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| an orbit in which a satellite orbits Earth at the same rate as Earth rotates and thus stays over the same place all the time |
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