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 …

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 …

5 days 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 …

• By measuring the ages of lunar rocks, we know that the moon is about 4.6 billion years old, or about the same age as Earth. • The distance between the Earth and its moon averages about...

1 day ago · Moon, or Luna in Latin, is planet Earth’s one and only natural satellite and the brightest object in the night sky. With a diameter of 2,159.2 miles (or 3,474 km), it is roughly …

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 …

Find the Moon’s illumination, distance, and latitude for any time on any date. The Moon has four primary and four intermediate lunar phases during a lunar month. Here's all you need to know …

1 day ago · Earth's gravity pulling on the Moon's tidal bulges created a force called torque, which slowed the Moon's rotation over time.

3 days ago · When astronauts next go to the moon, they'll find a little bit of home waiting for them. Atoms and molecules from Earth's atmosphere have been traveling across space to settle on …

With our 2025 Moon Phase Calendar, you'll find the current Moon phase for tonight—plus, all the phases of the Moon for each day of the month.