Mercury - The Inside Track
Baked and irradiated, Mercury is a cratered world; pock-marked by impactors that rained from space during the early development of our Solar System. With double sunrises, its day is twice as long as its year. Mercury‚Ä∞€™s orbit is now perpetually shadowed from the scorching Sun; scientists think there may be ice deposited by comets. In contrast, the un-Earthly Venus is a lifeless planet with a dense, choking atmosphere with temperatures that could melt lead.