Mercury is a small, rocky planet. It is the closest planet to the sun. During the day it can reach 467 degrees Celsius on the surface of Mercury, but at night it can drop to -170 degrees Celsius. Mercury is 57,909,175km from the Sun. Its radius is 2439.7 km.
Scientific name: Hg
Mercury, also called quicksilver, is the only metal that is liquid at room temperature. Mercury is a heavy metal and is very toxic. Mercury is used to dissolve gold in the process of gold mining, it was used in making felt, in older style thermometers, and in dental fillings.