| A | B |
|---|
| Star | An ojbect that produces its own energy, including heat and light. |
| Astronomical Unit (AU) | The average distance between the Earth and Sun |
| Asteroid | A rock that revolves around the Sun. |
| Comet | A mixture of frozen gases, ice, dust, and rock that circles around the Sun |
| tides | Caused by the gravity of the moon. |
| Satellite | an object in space that circles another object. |
| Solar System | Made up of the Sun, the planets, their moon, and other objects in space. |
| Gravity | The force that pulls objects toward one another is called |
| Fusion | The process that produces energy from the sun. |
| Ellipse | Egg-shape orbit that planets follow. |
| Orbit | Path one object takes around another object. |
| Inertia | The tendency of a moving object to keep moving in a straight line. |
| Meteors | Objects that cross paths with Earth and enter Earth's atmosphere. |
| Moon | Object that circles around a planet. |
| Telescope | Instrument that uses lenses to see distance objects. |
