Across
- 3. closet star to earth
- 6. study of celestial bodies
- 9. Imaginary Earth line
- 10. outer planet mission
- 14. Region of the Solar System beyond Neptune
- 16. Largest moon of Jupiter
- 19. distance that light travels in one year
- 20. star explosion
- 21. opposite of cheese burger
Down
- 1. largest planet in our solar system
- 2. nearest spiral galaxy
- 3. First artificial satellite to orbit Earth
- 4. procces in stars
- 5. Planets orbiting stars outside our Solar System
- 7. galaxy containing our solar system
- 8. instrument used for viewing distant objects
- 11. fastest rotating star
- 12. first moon landing mission
- 13. giant cloud of dust and gas
- 15. saturns prominent features
- 17. Space telescope named after an astronomer
- 18. red palnet