astronomy smart

123456789101112131415161718192021
Across
  1. 3. closet star to earth
  2. 6. study of celestial bodies
  3. 9. Imaginary Earth line
  4. 10. outer planet mission
  5. 14. Region of the Solar System beyond Neptune
  6. 16. Largest moon of Jupiter
  7. 19. distance that light travels in one year
  8. 20. star explosion
  9. 21. opposite of cheese burger
Down
  1. 1. largest planet in our solar system
  2. 2. nearest spiral galaxy
  3. 3. First artificial satellite to orbit Earth
  4. 4. procces in stars
  5. 5. Planets orbiting stars outside our Solar System
  6. 7. galaxy containing our solar system
  7. 8. instrument used for viewing distant objects
  8. 11. fastest rotating star
  9. 12. first moon landing mission
  10. 13. giant cloud of dust and gas
  11. 15. saturns prominent features
  12. 17. Space telescope named after an astronomer
  13. 18. red palnet