Science+questions+page+38

Science page 38 questions 1-4**
 * Angela Corrao

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

2. Gas planets differ from rocky planets because once gas planets are large enough their gravity is strong enough to attract the nebula gases. Rocky planets are to close to the sun which is why gas planets do not exists there because it its too hot for the gases to remain.

3. There is only planet in each orbit around the sun because if there was more than one planet orbiting at one time the gravitational pull would be messed up and the planets wouldn’t be able to orbit the sun as they do now.

4. All the planets rotate in the same direction because a force holds them in their place. If all the planets went in the same direction the planets would hit each other and the solar system wouldn’t function correctly.