DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Full Moon. Two bald eagles, Haliaeetus leucocephalus, in a tree which is silhouetted against a full Moon. The Moon does not produce its own light, but it can be seen because it reflects the light of the sun. The Moon's dark areas, or 'seas', are the remains of ancient plains of lava. The Moon's mass is unevenly distributed and Earth's gravity pulls the heavy parts more strongly than it does the lighter parts. This means that the Moon does not spin freely and that the heavier half always faces towards Earth. The bald eagle lives in North America and feeds on fish. Photographed in British Columbia, Canada.
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