Birth of the Solar System

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Across
  1. 1. Inner planets are made mostly of this and metal
  2. 2. A massive cloud of gas and dust where stars form
  3. 4. The largest planet formed just beyond the snow line
  4. 7. Original building blocks of planets
  5. 8. The force that caused the gas cloud to collapse
  6. 9. The disk of gas and dust surrounding the young Sun
  7. 10. Process by which particles stick together to form larger bodies
  8. 15. Boundary where water and gases can freeze
  9. 16. Early glowing form of the Sun before fusion began
Down
  1. 1. Boundary where rocky materials can condense
  2. 3. Period of intense impacts on inner planets
  3. 5. The spinning, flattened shape the collapsing cloud became
  4. 6. Increase in rotation speed as the cloud collapsed
  5. 11. 99.85 Percent of the solar system’s ____ is found in the Sun
  6. 12. The Sun becomes a true star when this fusion begins
  7. 13. Heavy element seeded into the nebula by a supernova
  8. 14. Explosive death of a massive star