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 …

Jan 23, 2026 · Your interactive map for observing the Moon each day of the year, featuring detailed views from NASA's Lunar Reconnaissance Orbiter, plus special Moon events.

Jan 21, 2026 · Discover fascinating Moon facts—from its size and orbit to gravity, brightness, and temperature. Learn what makes Earth’s Moon truly unique.

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.

3 days ago · Today's lunar phases, including the moon age and details such as moonrise and moonset. Discover when the moon will reach the full moon phase with a countdown timer.

2 days ago · Moon phase today January 28, 2026 What is moon today in Houston texas? Today's lunar phase in Houston texas, United States, the moon is in 🌔 the Waxing Gibbous phase, with 81.87% …

What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored Earth's only natural satellite half a …

4 days ago · NASA is moving into a new phase of space exploration, with major progress across human spaceflight, science missions, and advanced technology. In just one year, the agency has launched …

Jan 23, 2026 · 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 …

The moon is the Earth's only natural satellite and the closest celestial object. Learn about the moon and some of the theories about the moon's origin.