Solar system. Computer artwork of the planets of the solar system, seen from the surface of the Earth's Moon (lower left). The planets are (clockwise from upper left) Saturn, Uranus, Pluto, Venus, Earth, Jupiter and Mars. The large planet at upper centre is Neptune and the smaller planet at centre is Mercury. Mercury, Venus, Earth and Mars (the inner planets) are dense and rocky. Jupiter, Saturn, Uranus and Neptune are gas giants composed mainly of hydrogen and helium. Pluto, the smallest and most distant planet from the Sun, is also thought to have a rocky core. The Moon is the Earth's only natural satellite.
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