Across
- 3. The amount of matter in something
- 4. A material that can be seen or touched
- 6. The tendency of an object to resist a change in motion
- 7. A large mass that orbits a sun
Down
- 1. A push or pull
- 2. The space in between two things
- 4. The action of planets moving around a sun
- 5. Force that attracts other objects towards others