Space rock.

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Across
  1. 3. Planetoids
  2. 4. How compact something is
  3. 6. Earth's __________ around the Sun
  4. 8. Space rocks
  5. 11. Jupiter has many ____s
  6. 13. The plural is nebulae
  7. 16. Position that is relative
  8. 18. Some include Ceres, 4 Vesta, and 2 Pallas
  9. 20. ________ around an axis
  10. 21. Temprature of the surface
  11. 22. Our galaxy
Down
  1. 1. Warmth from the Sun trapped in the Earth's atmosphere
  2. 2. Saturn
  3. 5. Pluto
  4. 7. Jupiter
  5. 8. Space rocks that have entered Earth's surface
  6. 9. 93 million miles
  7. 10. What keeps us on Earth
  8. 12. The Earth _____s around the Sun
  9. 14. Space rock in the Earth's atmosphere Earth has many layers of it's ___________
  10. 15. Uranus
  11. 17. Tail of dust and gas
  12. 19. Mercury