Across
- 3. The study of space
- 7. A giant cloud of dust and gas in space
- 8. A giant mass of whirling water and air
- 9. A vehicle that is able to go to space
- 10. The largest planet in our solar system
Down
- 1. A person who travels into space
- 2. A term for a Russian or Soviet astronaut
- 4. A piece of rock that orbits the sun
- 5. An independent agency of the U.S. government
- 6. The planet closest to the sun