I. Campbell Space Crossword

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Across
  1. 4. Orbit Earth every 90 minutes.
  2. 5. North Star
  3. 7. Launched into low Earth orbit in 1990
  4. 9. The Milky Way is an example of ____
  5. 10. Its atomic # is 1
  6. 11. The force that stops us from floating away
  7. 13. The planet we live on
  8. 15. Space probe launched by NASA in 1977
  9. 16. This is what the Earth does around the sun
  10. 17. Twinkle, Twinkle little ____
  11. 18. If one of these comes close to earth then it will generate a shockwave through Earth's mantle.
  12. 19. Earth, Saturn, and Mars are all examples of ____
  13. 20. Can either be a stellar or planetary
Down
  1. 1. Amount of matter in something
  2. 2. The closest star system to our sun
  3. 3. Satellite
  4. 6. Nearly 6 Trillion miles long
  5. 8. A galaxy, it's also a candy.
  6. 12. The next galaxy closest to our galaxy.
  7. 14. The Big Dipper is an example of ____