👉 Mercury is a planet in our solar system, located between the sun and the Earth. It has been named after the Ancient Greek god Mercury, as he was known for his power and wisdom. Mercury's surface consists of a layer of ice called its hylidian crust, which is composed mainly of hydrogen and helium. The oceans beneath this crust are mostly salt water, with some small amounts of fresh water. Mercury also has a thin atmosphere, consisting primarily of nitrogen and oxygen. Mercury