1. Show with calculations why smaller planets' internal heat cools off faster than larger planets- even with the same composition.
2. Explain the implications that planet size has in the likelihood that earthlike life evolves?
3. If astronauts discovered single cell organisms in the soil at the equatorial region of Mars, how would they determine if this martian life form was unique to mars? What would be the implications if this life is similar to that of earth's biology?