Solar System Unit Crossword

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Across
  1. 2. Earliest model for the formation of the solar system
  2. 5. Small, at times active, object whose ices can vaporize in sunlight forming an atmosphere (coma) of dust and gas and, sometimes, a tail of dust and/or gas.
  3. 7. Primitive solar system
  4. 15. A small particle from a comet or asteroid orbiting the Sun.
  5. 17. Theory that the jovian planets formed directly from the solar nebula via instabilities in the gas leading to gravitational contraction
  6. 18. Matter in the solar system that is NOT part of a planet or moon
  7. 20. Asteroids that pass close to Earth
Down
  1. 1. Microscopic platforms which other atoms can attach
  2. 3. 17th Century French Philosopher
  3. 4. Theory that the jovian planets formed when icy protoplanetary cores became massive enough to capture gas directly from the solar nebula.
  4. 6. Rocky composition
  5. 8. Originate from the ejected matter of long-dead stars
  6. 9. Clump of material formed in the early stages of solar system formation that was the forerunner of the planets we see today.
  7. 10. Often referred to as “minor planets
  8. 11. A cloud of gas began to collapse under its own gravity to form the Sun + planets.
  9. 12. The building blocks of the solar system
  10. 13. Forerunner of the present-day Sun.
  11. 14. Composed of light gases
  12. 16. The breaking up of a large object into many smaller pieces
  13. 19. The gradual growth of small objects by collision + sticking