Nebular Theory Crossword

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Across
  1. 2. all the planets are in the same _
  2. 3. a process where small particles collide getting bigger then collect more and then more
  3. 4. shape that spins to get so hot and dense center to create the
  4. 5. it collapsed in this shape to start the solar system
Down
  1. 1. we all orbit in the same direction, the terrestrial planets are different than
  2. 2. the shape keeps spinning to from 8 or 9 circle objects