Star stuff

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Across
  1. 2. circling something
  2. 4. big bear
  3. 5. A connect the dots but with stars
  4. 8. Involves milk
  5. 12. A dead star
  6. 13. A star's mother
  7. 16. A ball of debris and stuff
  8. 17. The first element on the periodic table
  9. 18. found by his belt
  10. 19. rhymes with bubble
  11. 21. floaty thing in space
  12. 23. Ball of gas
  13. 25. how far light travels in a year
  14. 26. depicted as a dog/wolf and is Harry Potter's godfather
  15. 28. launched on September 5th, 1977
Down
  1. 1. a specific Slytherin character in Harry Potter
  2. 3. People live in space with this thing
  3. 6. In a _____ far far away
  4. 7. small bear
  5. 9. Newton's first law
  6. 10. we are here
  7. 11. Bunch of dwarf planets and cold debris
  8. 14. hour and a half
  9. 15. closest star outside of the solar system
  10. 20. closest star to our solar system
  11. 22. how much space it takes up
  12. 24. something newton discovered
  13. 27. north pole