| A | B |
|---|
| Galaxy | A group of planets that orbits a star and are held together by gravity. |
| Inner Planet | The 4 planets closest to the Sun, Mercury, Venus, Earth and Mars. |
| Outer Planet | The 5 planets farthest away from the sun, Jupiter, Saturn, Uranus, Neptune, Pluto. |
| Moon | A body that orbits a planet. |
| Asteroid | Pieces of rock, carbon, or metal that orbit the sun. |
| Meteoroid | A small piece of an asteroid or comet that orbits the sun. |
| Meteorite | A meteoroid that passes through the atmosphere and hits the Earth. |
| Orbit | To circle something. |
| Rotate | To spin. Earth rotates on its axis. |
| Telescope | A tool used to see things far away. |
| Satellite | Something that orbits something else. |
| Rocket | A vehicle that travels through Earth’s atmosphere into space. |
| Constellation | A group of stars. |
| Polaris | The North Star. Its position in the sky never changes. |
| Navigation | Finding your way around. |
