HENNING DALHOFF / SCIENCE PHOTO LIBRARY HENNING DALHOFF / SCIENCE PHOTO LIBRARY
Artwork of the Sun with the orbits of the Earth and Moon. Earth is the third planet from the Sun. The Moon (lower right) has a diameter just over a quarter of the Earth's. It orbits the Earth at a distance of around 385,000 kilometres, taking just over 27 days for one orbit. It does not have an atmosphere and is a heavily cratered and barren piece of rock. The Earth-Moon system orbits the Sun at a distance of about 150 million kilometres. A lunar eclipse occurs when the Moon passes directly behind the Earth into its shadow, and a solar eclipse occurs when the Moon moves between the Sun and the Earth.
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