JOHN FOSTER / SCIENCE PHOTO LIBRARY JOHN FOSTER / SCIENCE PHOTO LIBRARY
Earth and Moon. Illustration of the Earth and Moon, both partially illuminated by the Sun. The Moon is the Earth's only natural satellite. Its surface is characterised by numerous craters and large dark areas called lunar maria (seas). These are almost completely free of craters, suggesting they were formed by volcanic material that spread across the Moon's surface in recent geological times. Although the Moon appears very close to Earth in this picture, its true distance is about 30 times the diameter of the Earth.
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