Across
- 5. A person who explores outer space
- 7. The science of studying things outside of earth
- 8. A system of stars
- 9. Our Star
Down
- 1. Where humans live
- 2. A flaming ball of gas
- 3. A "Dwarf" Planet
- 4. A collection of stars given a name
- 6. A ball of condensed dust moving about the sun