LARRY LANDOLFI / SCIENCE PHOTO LIBRARY LARRY LANDOLFI / SCIENCE PHOTO LIBRARY
Full Moon. Image 14 of 27. Full Moon 14 days into its 28-day cycle. The Moon is full when the Earth-facing side is fully lit by the Sun. The continuing motion of the Moon in its orbit around the Earth will begin to move this Earth-facing side out of the sunlight. Darkness will encroach (here, from the right-hand side) as the lunar night falls on a waning Moon. The Earth-facing side of the Moon is locked in place by the gravitational influence of the Earth. This results in a lunar day that equals the length of the lunar Earth orbit.
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