MERCURY Mercury has a lot In common wilh Earth's moon. They're about the some size and both hove solid, heavily-cratered ground. Instead of o AVG TEMP: 167° C ■ 333° F MASS: 0.055 EARTHS ‘ Diameter: 3,032 mi 4,879 km . ORBIT: I doy = 176 Earth days I year = 0.241 Earth Years MOONS: 0 i mok