THIERRY LEGAULT / EURELIOS / SCIENCE PHOTO LIBRARY THIERRY LEGAULT / EURELIOS / SCIENCE PHOTO LIBRARY
Full Moon. North is at bottom. As the Moon orbits the Earth, the amount of sunlight seen on its visible hemisphere varies in a regular 28-day cycle. A Full Moon takes place after 14 days, at the midpoint of the cycle, when the Moon is on the opposite side of the Earth to the Sun. At this point, the Moon's surface can be clearly seen. The dark grey areas are the lunar seas, which formed early in the Moon's history as lava (molten rock) flowed into large impact craters and solidified. The lighter areas are rocky highlands. Photographed in Earth's southern hemisphere.
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