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 …

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 …

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: …

We see the full moon when the sun is directly behind us, illuminating a full hemisphere of the moon when it is directly in front of us.

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 …

3 days ago · See what moon phase it is tonight and find out when you can see the rest of the moon phases for 2025.

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

NASA's interactive map for observing the Moon each day of the year.

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 …

4 days ago · Cold Moon rising: How to see December’s supermoon, the last full moon of 2025 December’s full moon will shine brighter as it nears perigee, its closest point to Earth. The …