| A | B |
|---|
| Thrust | a reaction force that propels a rocket forward |
| rocket | a device that expels gas in one direction to move in the opposite direction |
| vacuum | a place that is empty of all matter |
| velocity | speed in a given direction |
| space station | a large artificial satellite in which people live and work |
| remote sensing | indirectly acquiring information about Earth's surface |
| space spinoff | an item used on Earth, but developed for use in space |
| orbital velocity | the velocity a rocket must achieve to establish an orbit |
| space probe | spacecraft that has scientific instruments but no human crew |
