JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Lunar eclipse. Total eclipse of the Moon, a phenomenon caused when the Moon enters the shadow cast by the Earth. This image shows the first moments after the totality phase: the bright portion at upper left is just emerging from the shadow of the Earth. During totality the Moon does not generally disappear. It is still visible due to the sunlight refracted onto its surface by the Earth's atmosphere. The colour of the lunar disc during an eclipse depends on the amount of dust and volcanic ash present in the atmosphere of the Earth. This is because these particles scatter blue light, making the sunlight appear red. Photograph taken in October 1996 in the USA.
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