Mercury

 Mercury  is the deepest and smallest  planet in the solar system (since Pluto was relabeled as a dwarf planet ), going around the Sun once every 88 days. Mercury is bright when seen from Earth, ranging from −2.0 to 5.5 in apparent magnitude, but it is not easily seen as its greatest angular separation from the Sun is only 28.3°: It can only be seen in the morning and evening twilight. Mercury is the closet planet to the sun. Physically, Mercury looks similar to the  Moon. It is heavily cratered and has no natural satellites and no substantial atmosphere. Mercury has a large iron core, which creates a magnetic field about 1% as powerful as the one on Earth. It is an extremely thick planet due to the huge size of its core. The surface temperatures on Mercury vary from about −180 to 430 °C, with having the sub solar point being the hottest point, and the bottoms of the craters near the poles being the coldest point. . Mercury has only a trace of atmosphere, mostly made up of sodium, helium and hydrogen. There appears to be more sodium than anything else in the thin atmosphere.
 * __Mercury __**

__**Facts about Mercury:**__ Mercury diameter is: 4,878 km

Distance from sun: 57,910,000 km

Mercury mass is: 3.30e23 kg

Mercury orbital speed is: 47.8km/sec