MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Earth and Moon. Artwork of a crescent Moon (upper right) seen above a limb of the Earth. The Sun is seen at centre. The phases of the Moon are caused by its orbit around the Earth, as it presents a differing amount of its lit side to us depending on its position relative to the Earth and Sun. The Moon lies at an average distance of 384,400 kilometres (km) from Earth, and completes an orbit in just over 27 days. Its diameter is 3476 km.
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