DAN SCHECHTER / SCIENCE PHOTO LIBRARY DAN SCHECHTER / SCIENCE PHOTO LIBRARY
Total lunar eclipse. Optical image of the total eclipse of the Moon of 21st January 2000. This phenomenon occurs when the Earth passes directly between the Moon and the Sun in space, and the Moon enters the shadow cast by the Earth. Even when totally shadowed the Moon does not disappear. It is still visible due to the sunlight refracted onto its surface by the Earth's atmosphere. The Moon usually appears reddish in such circumstances as the blue light is scattered more during its passage through the Earth's atmosphere. Photographed from Dunkirk, Maryland, USA.
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