Across
- 2. How far from earth is the North Star?
- 4. What do you call a group of systems?
- 6. what is the branch of astronomy that deals with the origin of the universe?
- 7. Every solar system must have a ____
Down
- 1. What is the theory that says that all the matter in the universe collided and rapidly expanded to from the universe?
- 3. Cosmic Background ______
- 5. What do you call a group of galaxies?
- 7. What do you call a group of clusters?