10 Facts about Mercury
1.  Planet closest to the Sun
2.  Only slightly larger than the Earths moon
3.  It has very little atmosphere to stop impacts so it has a lot of craters
4.  The day side of the planet is super heated from the Sun, but the night side drops hundreds of degrees below freezing
5.  Mercury goes in an egg shaped orbit around the Sun that takes it 88 days to complete
6.  Has a circumference of 9,525.1 miles
7.  With the gravity at 12.1, if you weighed 100lbs on Earth, you would weigh 38lbs on Mercury
8.  Gets its name from a messenger of the Roman Gods
9.  Mercury has no known Moons
10. One Mercury solar day equals 175.97 Earth days

For information about NASAs mission to mercury: