Planets
Mercury
The smallest planet and closest to the Sun
About Mercury
Mercury is the smallest planet in our Solar System and the closest to the Sun. It has no atmosphere, leading to extreme temperature swings.
Scientific Facts
Mercury has a diameter of 4,879 km. It orbits the Sun every 88 days. Its surface temperature ranges from -180°C to 430°C.
Interesting Facts
Mercury is only slightly larger than our Moon. A year on Mercury is just 88 Earth days.
Fun Facts
Mercury has no rings or moons. The Sun would appear 3 times larger from Mercury than from Earth.
Discovery
Known since ancient times.