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