Across
- 4. A space body that orbits a planet or asteroid
- 5. Earth's only natural satellite
- 7. The only known planet in the solar system to have life
- 9. massive, bright, sphere of very hot gas called plasma which is held together by its own gravity
- 10. The galaxy in which the solar system resides
- 11. A large, round object orbiting a star
Down
- 1. One complete trip around something in a circular path
- 2. The straight line distance through the center of an object, from one side to the other
- 3. The star around which Earth orbits
- 5. The amount of material in something
- 6. To move or travel around an object in a curved path
- 8. Spinning motion