Some facts about our planets. Astronomers often give the distances to objects within our solar system in terms of the astronomical unit, or AU. One astronomical unit is the approximate mean distance between the Earth and sun. It is 149,597,870,700m or about 150 million km or eight light-minutes. For the Moon, the average distance from the Earth is given.
Mercury Venus Mass (1024 kg) Density (kg/m3 Gravity (m/s2 ) Length of Day (hours)
Distance from sun (106
km, AU) ) 0.330 5427 3.7 4222.6
57.9 0.387
Orbital Velocity (km/s) 47.4 Mean Temperature (C) 167 Number of Moons 0 4.87 5243 8.9 2802.0