1. Earth were orbiting a 0.5-M star at a distance of 1 AU? What would be different for Earth and life on it? What effects would moving Earth closer to the lower-mass Sun have? 2. The Sun were a...

1. Earth were orbiting a 0.5-M star at a distance of 1 AU? What would be different for Earth and life on it? What effects would moving Earth closer to the lower-mass Sun have?

2. 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?