☿ Inner Solar System
Mercury
The solar system's smallest planet. Its most brutal.
Mercury is the runt of the inner solar system — and also its most brutal. Stripped of any meaningful atmosphere, it endures temperature swings of over 600 degrees between its sun-scorched days and frozen nights. No wind. No weather. Just rock, craters, and silence. The solar system's smallest planet is also its fastest, racing around the Sun in just 88 Earth days, as if it cannot bear to stay still.
"No wind. No weather. Just rock, craters, and silence."
Key Data
Distance from Sun
Day Length
Year Length
Surface Temperature
Moons
Orbital Speed
Diameter
Surface Gravity
One Remarkable Thing
Mercury's core makes up 85% of its radius — proportionally the largest iron core of any planet in the solar system. It should not exist the way it does.
Scale Relative to Earth
Mercury's diameter is just 4,879 km — about 38% of Earth's. It is smaller than Jupiter's moon Ganymede.