DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Moon from Earth. View from Earth of the full Moon in a pitch black sky. The Moon does not produce its own light, but it can be seen because it reflects the light of the sun. The dark areas, or 'seas', are the remains of ancient plains of lava. The craters visible are the result of meteorite impacts. Our planet has been similarly bombarded, but the process of weathering has destroyed most of the evidence. The Moon's mass is unevenly distributed and Earth's gravity pulls the heavy parts more strongly than it does the light parts. This means that the Moon does not spin freely and that the heavier half, with its familiar 'Man in the Moon' appearance, always faces Earth.
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