Rocky Planet#1 from the Sun
Mercury
The Swift Messenger of the Gods
Mercury is the smallest planet in our solar system and the closest to the Sun. Despite its proximity to the Sun, it's not the hottest planet — that title goes to Venus. Mercury has virtually no atmosphere, leading to extreme temperature swings between its day side (430°C) and night side (-180°C). Its surface is heavily cratered, resembling our Moon.
⚖
Mass
3.30 × 10²³
kg
◎
Diameter
4,879
km
↓
Gravity
3.7
m/s²
🌡
Temperature
167
°C avg
☀
Day Length
59
Earth days
⟳
Year Length
88
Earth days
↔
Distance from Sun
57.9
M km
Atmosphere
Virtually none — trace O₂, Na, H₂