1. Which planet would you expect to exhibit the greatest variation in apparent brightness as seen from Earth? Explain your answer. 2. Earth were 2 AU from the Sun? What would be the length of the...

1. Which planet would you expect to exhibit the greatest variation in apparent brightness as seen from Earth? Explain your answer.

2. Earth were 2 AU from the Sun? What would be the length of the year? Assuming that such physical properties as rotation rate were as they are today, what else would be different here?