What is the radius of the moon is it varie?
he Moon is Earth’s only natural satellite and the fifth largest satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is 384,403 kilometres (238,857 mi), about thirty times the diameter of the Earth. The common centre of mass of the system (the barycentre) is located at about 1,700 kilometres (1,100 mi)—a quarter the Earth’s radius—beneath the surface of the Earth. The Moon makes a complete orbit around the Earth every 27.3 days[nb 3] (the orbital period), and the periodic variations in the geometry of the Earth–Moon–Sun system are responsible for the phases of the moon, which repeat every 29.5 days[nb 4] (the synodic period). The Moon’s diameter is 3,474 kilometres (2,159 mi),[4] a little more than a quarter of that of the Earth. Thus, the Moon’s surface area is less than a tenth that of the Earth (about a quarter the Earth’s land area, approximately as large as Russia, Canada, and the United States combined), and its volume is about 2 percent
The Earth’s one natural satellite, the Moon, is more than one quarter the size of Earth itself (3,474 km diameter). Because of its smaller size, the Moon’s gravity is one-sixth of the Earth’s gravity, as we saw demonstrated by the giant leaps of the Apollo astronauts. While there are only two basic types of regions on the Moon’s surface, there are many interesting surface features such as craters, mountain ranges, rilles, and lava plains. The structure of the Moon’s interior is more difficult to study. The Moon’s top layer is a rocky solid, perhaps 800 km thick. Beneath this layer is a partially molten zone. Although it is not known for certain, many lunar geologists believe the Moon may have a small iron core, even though the Moon has no magnetic field. By studying the Moon’s surface and interior, geologists can learn about the Moon’s geological history and its formation. The footprints left by Apollo astronauts will last for centuries because there is no wind on the Moon. The Moon do
