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Illustration depicting the six known planets & their moons from Thomas Wright's book An Original Theory of the Universe, published in London in 1750. The two large planets are Jupiter (top) & Saturn (bottom), each shown with its respective satellites (top & bottom rows). The middle row shows, from left to right, Mercury, Venus, the Moon, Earth and Mars. All are drawn to scale. The larger bodies are depicted as having Earth-like continents & oceans, those of Jupiter being partially hidded by bands of cloud. In this book Wright (1711-86) gave the first correct explanation of the appearance of the Milky Way as being due to our immersion in a layer of stars.
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