MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Artwork of the solar system, showing the paths of the eight major planets as they orbit the Sun. The four inner planets are, from inner to outer, Mercury, Venus, Earth and Mars. The four outer planets are, inner to outer, Jupiter, Saturn, Uranus and Neptune. The star clouds of our galaxy, the Milky Way, appear as a broad luminous band at upper left.
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