Earth Science Space Crossword

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Across
  1. 2. orbit farthest from the sun
  2. 4. first element
  3. 7. Mars,Earth,Venus,Mercury
  4. 9. begining of nebula
  5. 10. form planets
  6. 11. Gas giant
  7. 12. Jupiter,Saturn,Uranus,Neptune
  8. 13. Smallest planet
  9. 15. galaxies are moving away
Down
  1. 1. Ensteins theory of general relativity
  2. 3. makes planetesimals into planets
  3. 5. gravity clumps masses together forming...
  4. 6. surrounds the star
  5. 8. pulled hydrogen and helium together
  6. 14. cosmic background radiation