In Roman mythology Mercury is the god of commerce, travel and thievery, the Roman counterpart of the Greek god Hermes, the messenger of the Gods. The planet probably received this name because it moves so quickly across the sky.

orbit: 57,910,000 km (0.38 AU) from Sun
diameter: 4,880 km
mass: 3.30e23 kg

Mercury is 58 million km. from the Sun.
It is the closest planet to the sun.
It takes only 88 Earth days for Mercury to orbit the Sun
The planet is bare and rocky with many craters formed by
asteroids
Mercury is the second smallest planet in our solar sysem .
It is only a little bigger than our moon.
Mercury has no moon. It does not have any atmosphere or water.
The planet rotates on its axis very slowly , once in 59 Earth days.
Its coldest temperature is -170 C
and the hottest is 430 C