In geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as wide as …

Feb 12, 2026 · The Earth and Moon are tidally locked. Their rotations are so in sync we only see one side of the Moon. Humans didn't see the lunar far side until a Soviet spacecraft flew past in 1959. …

6 days ago · Moon, Earth’s sole natural satellite and nearest celestial body. Known since prehistoric times, it is the brightest object in the sky after the Sun. Its name in English, like that of Earth, is of …

A natural satellite, or moon, is a small body that orbits a larger one. There are at least 200 known moons in the solar system, but most of these orbit one of the giant outer planets.

Earth gained its moon from a giant collision with another would-be planet billions of years ago. After the impact, some debris stayed in orbit around Earth and came together to form the Moon.

The moon orbits our planet at an average distance of 30 Earths. It rotates at the same rate that it revolves, so as it revolves around our planet, the same side of the moon faces the Earth at all times.

5 days ago · Planets gain moons through capture, collision, or formation — and gravity, size, and orbital distance all determine how many they can keep.

May 20, 2025 · Our solar system has hundreds of known moons orbiting planets and dwarf planets. Even some asteroids have moons. Moons – also called natural satellites – come in many shapes, …

May 23, 2023 · The moon, which is relatively large compared to our planet, is believed to have formed as a result of a collision between Earth and a smaller Mars-sized planet, based on analysis of lunar...

Mar 19, 2025 · Consequently, the moon does not fit the first criterion and is not classified as a planet. This distinction is crucial in understanding how astronomers categorize different celestial bodies, …