| A | B |
|---|
| rocket | A device that expels gas in one ditection to move in the opposite direction. |
| thrust | The reaction force that propels a rocket forward. |
| velocity | Speed in a given direction. |
| orbital velocity | The velocity a rocket must achieve to establish an orbit around a body in space. |
| escape velocity | The velocity an object must reach to fly beyond a planet's or moon's gravitational pull. |
| satellite | An object that revolves around another object in space. |
| space shuttle | A spacecraft that can carry a crew into space, return to Earth, and be reused. |
| space station | a large artificial satellite on which people can live and work for long periods. |
| space probe | a spacecraft that has various scientific instruments that can collect data. (Has no human crew) |
| rover | A small robotic space probe that can move about the surface of a planet or moon. |
| vacuum | A place that is empty of all matter. |
| microgravity | The condition of experiencing weighlessness in orbit. |
| space spinoff | Anitem that has uses on Earth but was originally developed for use in space. |
| remote sensing | The collection of information about Earth and other objects in space using satellites or probes. |
| geosynchronous orbit | 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. |
