Across
- 3. a robot probe
- 6. research lab in space
- 7. Bigness of something
- 8. a type of gas
- 11. live on it
- 13. big cloud of gas and dust
- 14. star in constellation
- 16. remains unchanged
- 17. a strong hole that nothing can escape
- 18. holds or pulls us
- 21. a distance that light travels
Down
- 1. 1 hour and 30 minutes
- 2. recognizable pattern
- 4. a region in outer solar system
- 5. Greek myth
- 8. pile
- 9. object that moves around larger obhect
- 10. a Galaxy in solar system
- 12. triple star system
- 15. a path around something
- 18. group of stars
- 19. Jupiter
- 20. a bright light you can see on the sky