mercury

MERCURY

Classification: Terestrial Planet

Length of Year: 88 Earth Days

Length of Day: 58.6 Earth Days

Diameter: 4,878 km (0.383 x Earths)

Mass: 3.30 x 1023 kg (0.055 x Earths)

Moons: None

Gravity: 0.378 x Earths

Atmosphere: 42% Oxygen, 29% Sodium, 22% Hydrogen

Mercury is the closest planet to the sun. It is the smallest of the eight major planets. It is known for its extremes in temperature. On the side facing away from the sun it can reach temperatures as low as -300 F. On the side facing the Sun it can get as hot as 800 F