Across
- 3. Rocky planets that formed near the heat of the young
- 5. The attractive force that caused the initial cloud to collapse.
- 7. A giant interstellar cloud of gas and dust from which the solar system formed.
- 9. The early, hot stage of a star forming at the center of a collapsing cloud.
- 11. Pierre-Simon Laplace, who published a more detailed version of the theory.
- 12. The physics principle that causes a collapsing cloud to spin more rapidly.
Down
- 1. The stage after a planetesimal, where the body is large enough to be spherical.
- 2. The flattened, rotating shape the nebula took as it spun faster.
- 4. This central body contains over 99% of the solar system's total mass.
- 6. The nuclear reaction that powers stars.
- 8. Gaseous planets that formed in the cooler outer disk.
- 10. The process where particles collide and stick together to form larger bodies.