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Illustration comparing the size of five comets to that of the Earth (A), from Thomas Wright's book An Original Theory of the Universe, published in London in 1750. The original caption is; "an exact scheme of the known comets, in just proportion, to the Globe of the Earth represented at A, with the Nuclus (sic), and part of the Tail of the Comet of 1665, B". C is the comet of 1682, D of 1665, E of 1742 and F of 1744. 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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