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 …

May 21, 2026 · The Moon makes Earth more livable, sets the rhythm of ocean tides, and keeps a record of our solar system's history. Explore NASA lunar science here.

Track the moon phase today with our interactive moon phase calculator. Get details on the current moon phase and the next full moon phase.

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. …

1 day 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 …

There are eight phases of the moon, which vary from partial to full illumination. The moon phases are also called lunar phases. These stages have different names that come from its shape and size at …

4 days ago · Watch the smallest full moon of the year live tonight during a rare 'Blue Moon' livestream from Italy with the Virtual Telescope Project.

May 26, 2026 · NASA will give an update on Tuesday afternoon (May 26) about its plans to build a moon base, and you can watch it live. An international team of researchers say they've found a more …

New Moon and Full Moon calendar with precise times and simulation of the Moon phase today. When is the next Full Moon?

4 days ago · A rare Blue Moon, the second full moon in May, will also be a "micromoon" near its farthest point from Earth.