Space words

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Across
  1. 2. shape or forming a ring shape
  2. 5. The compactness of matter
  3. 9. The path one object takes around another
  4. 12. A small, frozen mass of dust and gas revolving around the sun
  5. 14. A cloud of gas and dust
  6. 15. was the first international space station
  7. 17. The outermost part of the Sun's atmosphere
  8. 19. The lighter part of a shadow found on the shadow's edge
  9. 20. The path one object takes around another
Down
  1. 1. A group of stars, gas and dust held together by gravity.
  2. 3. Point directly above your head in the night sky
  3. 4. Study of the Earth using Physics
  4. 6. 3.26 light years
  5. 7. bright surface of the Sun
  6. 8. shuttle lifting off from a launch pad
  7. 10. A very small particle with no mass or charge
  8. 11. An object moving around a star
  9. 13. Ancient instrument used to tell time
  10. 16. Period between new moons. 29 days 12 hours 44 minutes.
  11. 18. The dark inner part of a sunspot, or shadow