MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Solar system. Computer artwork of the planets of the solar system. The planets are (clockwise from upper left) Saturn, Jupiter, Uranus, Venus, Earth, the Moon, Mercury and Neptune. The planet at centre left is Mars and the small planet at bottom left is Pluto. 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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