NASA / GSFC-SVS / SCIENCE PHOTO LIBRARY NASA / GSFC-SVS / SCIENCE PHOTO LIBRARY
Full Moon. The lunar phases arise as the Earth-Moon-Sun angle changes as the Moon orbits the Earth. The Moon is full (14 days into its 28-day cycle) when the Earth-facing side is fully lit by the Sun. Darkness will then encroach as the lunar night advances over the Earth-facing side of the Moon. This image, published in 2011, combines data from the Lunar Reconnaissance Orbiter and Clementine spacecraft. The image is part of a sequence of lunar phases (see images C011/1544-1551), orientated for the northern hemisphere. As well as the phases, the sequence also shows variations in the Moon's position and angle.
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