Mercury is the planet closest to our Sun, and it is the seven largest of the eight planets. Mercury is a small, rocky planet, much like Moon. It is covered with craters and has changed very little from when it was firdt formed.
It was once believed that there was no water on Mercury, but this turned out to be false. Recent radar information shows evidence of ice at Mercury’s north pole! The ice hasn’t melted because it is protected from the Sun’s heat by shadows of some craters. Unlike many of our nine planets, Mercury has no moons