MERCURY

Average Distance From Sun 36.0 million miles (57.9 million km)   Mass 0.055 (earth = 1)..   Diameter 3032 miles (4,879 km) Surface Gravity 0.38 (earth = 1)   Length of Day 58.646 days   Length of Year 87.969 days Mean Surface Temperature 350* C (day) -170* C (night) Inclination to Axis practically 0 degrees Albedo 0.06 Escape Velocity 4.3 km/s   Known Moons 0

Mercury orbits the sun faster than any other planet; zipping along at 29 miles per second. Mercury is only slightly larger than the Earth's moon. Mercury is often hard to see because it always lies close to the sun.