Edgar's space crossword puzzle

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Across
  1. 3. something that is used to explore interstellar and our solar system
  2. 6. a space station that people use
  3. 7. the amount of resistance you get from an object
  4. 8. this makes up about 75% of our universe
  5. 11. we live on it
  6. 13. a giant cloud of dust in space
  7. 14. a star that is in the north
  8. 16. something that has force and keep on moving
  9. 17. something that has so much gravity that not even light can escape it
  10. 18. a force that pulls things
  11. 21. something that is 10000 years away
Down
  1. 1. how long it takes for a satellite to orbit
  2. 2. pattern in stars that tell mythological stories
  3. 4. a belt that is past out solar stystem
  4. 5. a greek myth
  5. 8. something that proved there was other galaxies
  6. 9. something that can be used to gather data in space
  7. 10. it is the galaxy that we live in
  8. 12. the closet star to us besides the sun
  9. 15. when the planets rotate around the sun
  10. 18. something that has a lot of stars and a lot of planets in it
  11. 19. earth is a
  12. 20. something that is mostly made of helium and hydrogen and very hot