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 contiguous United States).

2025年1月31日 · 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 Germanic and Old English derivation.

2025年1月30日 · As the Moon orbits Earth, different parts are in sunlight or darkness at different times. The changing illumination is why, from our perspective, the Moon goes through phases. During a “full moon,” the hemisphere of the Moon we …

6 天之前 · The Moon makes Earth more livable by moderating our home planet’s wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years. The Moon rotates exactly once each time it orbits our planet.

2025年1月14日 · Earth has just one moon – a rocky, cratered place, roughly a quarter the size of Earth and an average of 238,855 miles away. The Moon can be seen with the naked eye most nights as it traces its 27-day orbit around our planet.

The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years.

2023年11月22日 · The Moon completes an orbit of the Earth every 27.3 days (approximately 655 hours). The Moon also rotates on its axis. Because of tidal forces, it completes one revolution every 655 hours.

2023年9月7日 · The Moon is Earth’s only permanent natural satellite, and it’s the fifth-largest satellite in our solar system.

2025年1月17日 · Sometimes the Moon seems to disappear. These shifts are called moon phases. The eight lunar phases are, in order: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. The cycle repeats once a month (every 29.5 days).

NASA's interactive map for observing the Moon each day of the year. WHAT WILL YOU SEE? This shows the Moon’s current phase in two ways: the percentage of the Moon’s nearside that …