Stars/constellations cross word

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Across
  1. 3. Space probe launched in 1977
  2. 6. Place in space where people live
  3. 7. What makes an object big or small
  4. 8. Number 1 on the periodic table
  5. 11. The planet we live on
  6. 13. Cloud of space nutrients that creates stars
  7. 14. A 4 wheeler brand, is also the north star
  8. 16. If an object has momentum, it has this
  9. 17. What comes after a star explodes
  10. 18. What keeps us connected to the Earth, a force
  11. 21. Space unit of measurement
Down
  1. 1. A soccer match's length
  2. 2. Something that a bunch of stars together make
  3. 4. Ring of dwarf planets by Neptune
  4. 5. The nearest galaxy
  5. 8. Space telescope
  6. 9. Something that orbits around Earth
  7. 10. Candy bar
  8. 12. Closest star to us
  9. 15. What a satellite does around Earth
  10. 18. Samsung phones
  11. 19. What Earth is
  12. 20. Big ball of hot gas