DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Crescent Moon from Earth orbit, computer artwork. The non-sunlit Earth-facing parts of the Moon are being illuminated by sunlight reflected from the Earth, a phenomenon known as 'Earthshine'. The phases of the Moon occur as it moves into and out of the light of the Sun as it orbits the Earth. The thin blue haze seen along the Earth's limb is its atmosphere, which fades out into space around 100 kilometres above the surface.
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