Pg.+38


 * Paige H. Pg. 38, #1-4**

1. Gravity and pressure balance each other out to keep a nebula of dust and gas particles from collapsing together or flying apart.

2. Gas planets differ from rocky planets because when gas planets get large enough, their gravity is strong enough to attract nebula gases. Rocky planets are too close to the sun for gas planets to exist there. It would be too hot for the gases.

3. There is only planet in each orbit around the sun because if there were more than one planet orbiting at one time, the gravitational pull would be out of line, and the planets could not orbit the sun like they do as of now.

4. All of the planets rotate in the same direction because a force holds them in their place, on their own axis's. If all the planets went in the same direction, the planets would hit each other, therefore making our solar system dysfunctional.