- Closest planet to the sun
- Named after the Roman God Mercury (aka, Greek God Hermes) messenger to the Gods
- 88 days to orbit the sun
- 57 million km from the sun
- 465C facing the sun and -184C away from the sun
- Has no atmosphere, only hydrogen and helium
- 4875 km in diameter or 5% of the Earths mass.
- Primarily made of iron with a thin crust it is the second densest planet in the solar system
- The surface is wrinkled from the large core and thin crust and scarred from many collisions with asteroids
- Has no moons
