Across
- 2. place in which very little matter exists
- 6. large collection of stars,gas and dust held together by gravity
- 7. large group of smaller galaxy clusters or galaxy groups
- 8. space and all the matter and energy it contains
Down
- 1. natural sattilite of earth
- 3. large balls of gas
- 4. celestial body moving in a circular orbit around a star
- 5. a group of stars or galaxies forming a relatively close relationship