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 …

Dec 26, 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 …

Dec 17, 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 …

18 hours ago · Here's what to expect when the "Wolf Moon" prowls over the horizon tonight, kicking off a spectacular natural light show as the first full moon (and supermoon) of 2026.

15 hours ago · The first full moon of 2026 will be a special event known as a supermoon. Here's what it means and when it will peak.

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 …

5 days ago · The moon and sun share top billing in 2026. Kicking off the year's cosmic wonders is the moon, drawing the first astronauts to visit in more than 50 years.

Dec 4, 2025 · Order Your Almanac Today! Never miss a full moon, eclipse, or meteor shower with reminders from the Almanac Daily newsletter. All times in Central time.

Nov 6, 2025 · Earth's atmosphere leaks all the way out to the moon. Anomalous amounts of volatile elements found in the Apollo samples brought back from the moon have been traced …

Dec 26, 2025 · Moon - Craters, Highlands, Maria: The Moon is a spherical rocky body, probably with a small metallic core, revolving around Earth in a slightly eccentric orbit at a mean …