MICHAEL DUNNING / SCIENCE PHOTO LIBRARY MICHAEL DUNNING / SCIENCE PHOTO LIBRARY
Solar system. Computer artwork of the planets of the solar system, seen from the Earth's surface (bottom). The planets are (clockwise from upper left) Saturn, Jupiter, Mars, a cloudless Venus, Uranus and 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 and Uranus are gas giants composed mainly of hydrogen and helium.
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