Across
- 2. needed to find the density of an object
- 3. When an object circles around another object
- 4. takes one month
- 5. star that keeps all the planets in orbit
- 7. when the moon appears fully lit
- 9. when half of the moon appears illuminated
Down
- 1. the amount of mass in a given area or space
- 4. amount of matter in an object
- 6. Moon is not visible from Earth
- 8. a large object that orbits Earth