WORLDWALKMercury
Planet · 0.39× Earth's distance from the Sun
The smallest planet and the closest to the Sun. With no air to hold heat, the ground bakes at 430 °C by day and freezes to −180 °C at night. The Sun looks about three times bigger than from Earth.
▶ Land on MercuryFree · plays in your browser
Gravity3.7 m/s²0.38× Earth measured
Size0.38× Earth (2,440 km radius)
Mass0.055× Earth
Temperature−180 °C at night to 430 °C by day
AirNone (thin exosphere)surface pressure almost none
One day176 Earth days from one sunrise to the next
One year88 Earth days
Walking on Mercury
- A 70 kg explorer would feel like 26 kg.
- A jump that clears 50 cm on Earth would reach about 133 cm.
- Each jump floats for seconds before you drift back down.
- With almost no air, a hammer and a feather fall side by side, and sound cannot travel.
Landmarks in the game
- Caloris-style basin (scaled down): Caloris Basin is about 1,550 km wide, one of the largest impact craters in the solar system. The impact shook the planet so hard that it jumbled the ground on the opposite side.
- Giant cliff (scaled down): Mercury is crossed by cliffs hundreds of kilometers long and up to 3 km high. They formed as its huge iron core cooled and the whole planet shrank.
- Ice near the poles: Even this close to the Sun, some craters near the poles never see sunlight, and NASA's MESSENGER spacecraft found water ice hidden inside them.
Real maps, real physics. Gravity, temperature and air pressure are the real values, and they change how you move, what you hear and how long your suit lasts.
Play Mercury