RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Earth and Moon. Artwork of a crescent Moon (far left) seen from Earth orbit. The Moon's diameter is around a quarter of that of the Earth, but it orbits the Earth at a distance of around 385,000 kilometres, appearing about the same size as the Sun. The Moon's phases are seen as it moves in 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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