![The eight planets of the solar system and Pluto, in a montage of images scaled to show the …[Credits : NASA/Lunar and Planetary Laboratory]](http://media-2.web.britannica.com/eb-media/01/81401-004-2B2364B6.jpg)
The eight planets of the solar system and Pluto, in a montage of images scaled to show the approximate sizes of the bodies relative to one another. Outward from the Sun, which is represented to scale by the yellow segment at the extreme left, are the four rocky terrestrial planets (Mercury, Venus, Earth, and Mars), the four hydrogen-rich giant planets (Jupiter, Saturn, Uranus, and Neptune), and icy, comparatively tiny Pluto.
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