Mercury - The Smallest Planet

Overview of Mercury

Mercury Image

Image of Mercury

Position from the Sun 1st Planet
Orbital Period 88 Earth days
Diameter 4,880 km
Mass 3.30 × 1023 kg
Moons None
Atmosphere Thin, mostly oxygen, sodium, hydrogen, helium, and potassium
Surface Features Craters, plains, cliffs
Temperature Range -173°C to 427°C
Interesting Fact Mercury has no atmosphere to retain heat, causing extreme temperature variations.

Learn more about Mercury.