DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Moon rising over Earth's horizon, computer artwork. Earth and the blue haze of its atmosphere can be seen at top left. It is thought to be the only planet in the solar system that can support life. The Moon (brown, centre) has a diameter just over a quarter of the Earth's. It orbits at a distance of around 385,000 kilometres, taking nearly 30 days for one orbit. It does not have an atmosphere and is a heavily cratered and barren piece of rock.
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