The Moon is the sole natural satellite of the Earth. It is the Solar System's largest natural satellite in terms of the size of its planet, the fifth largest satellite overall, and larger than any known dwarf planet. With a total mass of less than 10 tonnes, the Moon has a fragile atmosphere that is virtually vacuum. It has about a sixth of Earth's surface gravity (0.1654 g). This little mass has a surface pressure of roughly 3 1015 atm, which changes according on the lunar day. The distance between the Moon and Earth ranges between 356,400 kilometres and 406,700 km. As the commander of the American mission Apollo 11, Neil Armstrong became the first person to walk on the Moon, doing so on July 21, 1969.
The Moon has a solid, iron-rich central chamber and a fluid, liquid-iron-based outer layer. A partially molten barrier layer protects the core.
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