Mercury is the closest planet to the sun, which makes it the most difficult planet for scientists to study. If you could stand on mercury, the sun would look three times bigger than on earth. Mercury can get as close as 47 kilometers to the sun. A big difference between Mercury and all the other planets is the size of its iron core. Mercury’s iron core makes up about 65 percent of its total mass. Mercury got its name from the swiftest of the Roman gods, the messenger god.
Mercury is the smallest of our eight planets in our solar system, however it orbits around the sun the fastest. It travels around the sun every 88 days, at 50 kilometers per second. One day on mercury lasts 59 earth days. Mercury has no moons. It is small, but heavy because