Homework 6: Due October 10, 2007

1. Read Mystery 2 AND Mystery 6
2. If the Earth went around the Sun three times faster than it does now, what would be the length of the solar day? (Yes, I know. You've had this several times already. That should be a hint that I think it's important that you can make this picture in your head!)
3. You have, so far, learned of 3 reasons that objects might have color. Which of these is dominant for stars? Which is dominant for people? Which is impossible to distinguish with your eye (in most cases)?
4. What physical law causes stars to collapse out of big clouds of dust and gas?
5. What physical law causes a disk to form?