Science stuff

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Across
  1. 3. The farthest human-made thing in space
  2. 6. A collaberative research facillity
  3. 7. The weight of somthing
  4. 8. The simplest element
  5. 11. The planet we live on
  6. 13. It tends to serve as a star nursery
  7. 14. The north star
  8. 16. A object stay at rest unless acted upon by an outside force, viceversa
  9. 17. A Region is space so dense that light cant excape
  10. 18. Keeps us from not floating away
  11. 21. The distance between stars and galaxies
Down
  1. 1. It takes the ISS this amount of time to go around the sun
  2. 2. Scorpius and leo
  3. 4. Donut shaped region beyond nebtunes region
  4. 5. A constellation and a galaxy
  5. 8. A large advanced space telescope
  6. 9. An object that moves around a bigger object
  7. 10. A type of candy
  8. 12. A star system that consists 3 stars
  9. 15. Our planets do this around the sun
  10. 18. Milky way
  11. 19. We live on one
  12. 20. Polaris and Sirius