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| a device that expels gas in one direction to move the rocket in the opposite direction |
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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 Earth |
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| the velocity a rocket must reach to fly beyond a planet's gravitational pull |
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| speed in a given direction |
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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 carries scientific instruments that can collect data, but has no human crew |
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| small robots that are able to move around on the surface of a planet |
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| a place that is empty of all matter |
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| the condition of experiencing weightlessness in orbit |
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| an item that has uses on Earth but was originally developed for use in space |
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| collection of information about Earth and other objects in space without being in direct contact |
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| when a satellite orbits Earth at the same rate as Earth rotates and thus stays over the same place over Earth's equator all the time |
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