At Mercury's equator, it is really hot at noon, over 400C, and really cold at midnight, below -170C. If you were an astronaut on the surface of Mercury at the equator, the only way to have a comfortable temperature would be at the terminator, where sunset and sunrise occur. How fast would you need to drive your rover to keep the temperature comfortable? For the sake of simplicity, assume that Mercury's orbit is circular. The information you need is Mercury's mean radius, 2440 km Mercury's orbital period, 87.97 Earth days Mercury's rotation rate. Mercury rotates 3 times for each 2 orbits around the Sun, so if you are on the surface of Mercury, you experience one day every two Mercury years. Important Notes: Need to derive one circumference of Mercury each Mercury Day. You will not experience one day on Mercury in its one rotation. ~I think the answer is 3.63, please redo question to confirm my work~