Mercury is the closest to the Sun. Mercury looks a lot like the earth's moon. The Surface temperatures on Mercury get hot enough to melt. It is a very fast planet. Mercury is a silver-colored liquid then when it is put at room temperature it turns into rock.
Mercury conducts electricity.
Mercury is surrounded by an extremely small amount of helium, hydrogen, oxygen, and sodium. Mercury is 28,600,000 miles away from the Sun which is the closest to the Sun. Mercury's circumference is about 9,517.34 miles long. Mercury appears only as a tiny dot compared to the big Sun. Mercury moves around the Sun faster than any other planet.