| Term | Definition |
|---|
| rocket | a machine that uses escaping gas to move into outter space |
| NASA | National Aeronautics and Space Administration |
| thrust | reaction force which propels a rocket forward |
| artificial satelite | any human-made object placed in orbit around a body in space |
| low Earth orbit | an orbit less than 1,500 km. above the Earth's surface. |
| geostationary orbit | an orbit that is about 36,000 km above Earth's surface and in which a satellite is above a fixed spot on the equator |
| space probe | an unmaned spacecraft that is sent to discover the unknown parts of space |
| space shuttle | a spacecraft launched like a rocket that can return to earth and land like a plane |
| space station | a long-term orbiting platform from which other vehicles can be launched or scientific research can be carried out |
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