Astronomy Crossword Puzzle

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Across
  1. 3. comprised of gaseous material
  2. 6. cloud of dust, ice, and gas
  3. 7. start of everything
  4. 9. first element to form
  5. 10. smallest planet
  6. 11. matter condenses into
  7. 12. mass is moving away from each other
  8. 14. forms in the center of a nebula
Down
  1. 1. attach to protons to form atoms
  2. 2. clumps combine into
  3. 4. gas giant
  4. 5. energy times the speed of light squared equals
  5. 8. comprised of rocky material
  6. 13. force that pulls matter together