| A | B |
|---|
| Axis | An imaginary center line that an object rotates around. |
| Moon phase | The changing of the Moon's shape from Earth. |
| Satellite | An object in orbit around another object. |
| Solar system | Made up of the Sun and its satellites. |
| Space probe | A spacecraft that gathers information without a crew aboard. |
| Asteroid | A wide, rocky mass that orbits the Sun. |
| Comet | Frozen mass of ice and dust that orbits the Sun. |
| Rotation | This movement by Earth causes day and night. |
| Revolution | One full orbit of an object around another object is called ____. |
