- Mass: 330,104,000,000,000 billion kg
- Equatorial Diameter: 4,879
- Polar Diameter: 4,879
- Equatorial Circumference: 15,329 km
- Known Satellites: none
- Notable Satellites: none
- Orbit Distance: 57,909,227 km
- Orbit Period: 87.97 Earth days
- Surface Temperature: -173 to 427°C
Facts about Mercury
A year in Mercury is just 88 days long:
One day on Mercury lasts the equivalent of 176 Earth days.
Mercury is the smallest planet in the Solar System:
One of five planets visible with the naked eye a, Mercury is just 4,879 Kilometers across its equator, compared with 12,742 Kilometers for the Earth.
Mercury is the second densest planet:
Even though the planet is small, Mercury is very dense. Each cubic centimeter has a density of 5.4 grams, with only the Earth having a higher density. This is largely due to Mercury being composed mainly of heavy metals and rock.
Mercury has wrinkles:
As the iron core of the planet cooled and contracted, the surface of the planet became wrinkled. Scientist have named these wrinkles, Lobate Scarps. These Scarps can be up to a mile high and hundreds of miles long.
Mercury is only the second hottest planet:
Despite being further from the Sun, Venus experiences higher temperatures. The surface of Mercury which faces the Sun sees temperatures of up to 427°C, whilst on the alternate side this can be as low as -173°C. This is due to the planet having no atmosphere to help regulate the temperature.
Mercury is the most cratered planet in the Solar System:
Unlike many other planets which “self-heal” through natural geological processes, the surface of Mercury is covered in craters.
Mercury has an atmosphere (sort of):
Mercury has just 38% the gravity of Earth, this is too little to hold on to what atmosphere it has which is blown away by solar winds. However while gases escape into space they are constantly being replenished at the same time by the same solar winds, radioactive decay and dust caused by micrometeorites