EarthMoon

EarthMoon is a term used to describe the natural satellite of Earth, commonly known as the Moon. It is the fifth largest natural satellite in the Solar System and the largest relative to the size of its planet. The Moon's diameter is approximately one-quarter that of Earth, making it the largest moon in the Solar System relative to the size of its host planet. Its surface is covered with craters, mountains, and lava plains, and it has no significant atmosphere or magnetic field. The Moon's gravitational influence produces the ocean tides and the slight lengthening of the day. The Moon is tidally locked to Earth, meaning it rotates on its axis in the same time it takes to orbit Earth, resulting in the same side always facing Earth. The Moon's origin is still debated, with the leading theories being the giant impact hypothesis and the co-formation theory. The Moon has been visited by humans through the Apollo program, and it continues to be a subject of scientific study and exploration.