JOHN SANFORD / SCIENCE PHOTO LIBRARY JOHN SANFORD / SCIENCE PHOTO LIBRARY
Lunar eclipse. The Moon emerging from totality during a lunar eclipse. The bright area at left is full sunlight returning as the Moon passes out of the shadow of the Earth. The red light on the parts of the Moon still in shadow is due to sunlight passing through the Earth's atmosphere. Shorter wavelengths, such as blue light, are scattered more in the atmosphere than longer wavelengths such as red light. Lunar eclipses occur only at full Moon, and then only when the Earth and Moon are correctly aligned (about 2-3 times a year). Photographed from the northern hemisphere on 28 August 2007.
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