Formation of Solar System - Planetary formation

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Across
  1. 3. a shock from ____ started the formation of the solar system
  2. 4. the ___ formed first
  3. 6. what a solar nebula is made up of
Down
  1. 1. the solar system formed from?
  2. 2. then ___ forming then orbited 5 down
  3. 5. then ___ started orbiting 4 across