The full Moon

Moon, planets & eclipses

Image: NASA's Goddard Space Flight Center / LRO

The Moon's phases repeat every 29.5 days and set how dark the night sky is.[1] Five planets, Mercury, Venus, Mars, Jupiter and Saturn, are easy to see without a telescope, and on most nights at least one is up.[2] When the Sun, the Moon and Earth line up, there is an eclipse: a solar eclipse at new Moon, a lunar eclipse at full Moon.[3]

Happening now

Notable

Guides

Terms

All terms in the Glossary

Sources

  1. [1]NASA, Moon Phases — science.nasa.gov, retrieved October 26, 2026
  2. [2]NASA, Skywatching — science.nasa.gov, retrieved October 26, 2026
  3. [3]NASA, Eclipses — science.nasa.gov, retrieved October 26, 2026