MICHAEL DUNNING / SCIENCE PHOTO LIBRARY MICHAEL DUNNING / SCIENCE PHOTO LIBRARY
Solar system. Computer artwork of the planets of the solar system, seen above the Earth's surface (bottom). The planets are (clockwise from upper left) Saturn, Uranus, Jupiter, a cloudless Venus and Neptune. The red planet at centre is Mars and the small planet at lower left is Mercury. Mercury, Venus, Earth and Mars (the inner planets) are dense and rocky. The Earth is unique in possessing vast oceans of liquid water. Jupiter, Saturn, Uranus and Neptune are gas giants composed mainly of hydrogen and helium.
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