Mercury

Planet Properties (Orbit and Rotation based on Earth's years/days/hours/minutes)

Distance to Sun: 35,983,095 miles

Equatorial radius: 1,516 miles

Equatorial circumference: 9,525 miles

Length of year(Orbit): 87.97 Earth days

Length of day(Rotation): 58d 15h 30m

Axial tilt: 0 degrees

Number of moons: none

Mercury has the widest temperature range of any planet in the solar system, from -170 degrees °C (-274 °F) at night to 350 °C (662 °F) during the day. Its landscape is dominated by the Caloris Basin, the 1,300 kilometer- (800 mile-) wide legacy of an impact that remodeled the planet, sculpting a global web of concentric mountain ranges, lava plains, ridges, faults and depressions.

Caloris Basin
The huge, multiringed Caloris Basin impact crater is about 840 miles across. The Asteroid that caused it was about 60 miles wide. The resulting seismic waves traversed Mercury, shattering the surface on the other side, before traveling back to cause fracturing and landslides.

Cratered World
Mercury is a dry, rocky world reminiscent of Earth's Moon.
It has a very old surface, much of which is very heavily cratered, rather like the lunar highland. The remaining area is younger; it consists of more lightly cratered plains of solidified volcanic lava, somewhat similar to the lunar maria.

Brahms Crater
This bowl-shaped crater is 60 miles across and was formed when an asteroid hit Mercury about 3-5 billion years ago. It has a prominent central mountainous peak and inner walls that have slipped inward due to structural weakness and the influence of gravity.

The Planets

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