Formation of Sun Crossword

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Across
  1. 4. describes how the solar system formed
  2. 6. ___ observation is one way we figured out the solar nebula theory
  3. 8. material being reused from star to star
  4. 10. where heavy elements come from--the __ of dead stars
Down
  1. 1. formed from leftover material in solar nebula
  2. 2. example of light element
  3. 3. the main force causing the nebula to collapse
  4. 5. how the nebula sped up as it rotated when material fell the the middle
  5. 7. Carbon is a(n) __ element
  6. 9. gas cloud in space or a stellar nursery