Across
- 4. took the small step
- 5. only spacecraft to visit Neptune
- 6. largest planet in our solar system
- 7. our galaxy
- 10. popular theory or comedy series
- 11. comet that collided with Jupiter in 1994
- 13. Vader's voice
- 16. space transportation
- 17. asteroid endangering Earth movie
- 18. wolves sing to it
Down
- 1. 2nd planet from the sun
- 2. NCC-1701
- 3. Mars rover
- 8. created when stars explode
- 9. where light ends
- 11. largest constellation
- 12. strongman constellation
- 14. last shuttle mission
- 15. smallest & densest stars