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 the …

Nov 27, 2025 · 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 …

Jun 25, 2025 · 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. …

3 days ago · December’s full cold supermoon is peaking this week as the anniversaries of two Apollo missions approach.

Sep 7, 2023 · The Moon is about one-fourth the size of Earth. It's primarily composed of rock and minerals, with a small iron core. The Moon's average distance from Earth is roughly 239,000 miles. …

1 day ago · December cold moon was the last supermoon of 2025: What to know about the celestial event The last supermoon of 2025 lit up the night sky on Dec. 4.

Sep 25, 2025 · The other side of the Moon is dark. The position of the Moon and the Sun during Each of the Moon’s phases and the Moon as it appears from Earth during each phase. Credit: NASA/JPL …

1 day ago · Discover the moon like never before! Interactive moon phases, 3D moon exploration, moon landing history, and lunar calendar designed for children. Learn about the moon through NASA …

The Moon's orbit around Earth has many variations (perturbations) due to the gravitational attraction of the Sun and planets, the study of which (lunar theory) has a long history. [7] Moon's orbit and sizes …

Nov 27, 2025 · Throughout the 17th, 18th, and 19th centuries, investigators examined different theories on lunar origin in an attempt to find one that would agree with the observations. Lunar origin theories …