| A | B |
|---|
| revolution | Movement of one object around another. |
| constellation | A group of stars that forms a pattern in the sky. |
| telescope | An instrument that makes things that are far away look clearer and bigger. |
| orbit | Path an object takes around another object. |
| asteroid | Chunks of rock or metal that orbits the sun. |
| lunar eclipse | Result of Earth's shadows falling on the moon. |
| phases | The different shapes the moon seems to have. |
| star | A hot ball of glowing gases. |
| solar system | The sun and objects that orbit around the sun. |
| axis | An imaginary line (stick) that goes through the North Pole and South Pole. |
| planet | A large body of rock or gas that orbits the sun. |
| rotation | Spinning of an object on its axis (like a top). |
| solar eclipse | Result of the moon's shadow falling on Earth. |
| comet | A large ball of ice and dust that orbits the sun. |
| gravity | The force that causes the objects in the solar system to stay in orbit. |
| 24 hours | The length of time it takes the Earth to rotate. |
| inner planets | The planets closest to the Sun and have rocky surfaces. |
| seasons | What happens because of the tilting of the Earth's axis. |
| outer planets | The planets that are farther from the sun and made of gases. |
