1. The Sun were a variable star? How would this change life on Earth, and, assuming we could live in orbit around such a star, how might it change our perspective of the cosmos? 2. To test your...

1. The Sun were a variable star? How would this change life on Earth, and, assuming we could live in orbit around such a star, how might it change our perspective of the cosmos?

2. To test your understanding of variable stars, do Interactive Exercise 12-2 on the Web. You can print out your results, if required.

3. To test your understanding of close binary star systems, do Interactive Exercise 12-3 on the Web. You can print out your results, if required.