AVERAGE DISTANCE FROM THE SUN
35,980,000 miles (57,900,000 km)
3,030 miles (4,878 km)
LENGTH OF DAY
59 Earth days
LENGTH OF YEAR
88 Earth days
NUMBER OF MOONS
AVERAGE SURFACE TEMPERATURES
-300° to 800°F (-183° to 427°C)
Orbiting closest to our sun, Mercury is the smallest of the terrestrial planets. It has a rocky, cratered surface similar to Earth's moon.
The Romans named it after their speediest messenger god because it crossed the night sky faster than any other planet.
Due to extremely hot temperatures of up to 800°F (427°C) during its day, Mercury cannot keep an atmosphere. Temperatures drop to -300°F (-183°C) at night.
If someone stood on the surface of Mercury at its closest point to the sun, the sun would appear three times the size as viewed on Earth.
Exploring the planets, moons and other bodies orbiting our sun.