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wood prints terminator wood prints mountain wood prints space wood prints book wood prints moon wood prints notes wood prints paper wood prints mare wood prints history wood prints astronomy wood prints history of science wood prints sketch wood prints monochrome wood prints black-and-white wood prints 17th century wood prints

photographs terminator photos mountain photos space photos book photos moon photos notes photos paper photos mare photos history photos astronomy photos history of science photos sketch photos monochrome photos black-and-white photos 17th century photos

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Galileo's Moon observations. Sketch of the Moon made in 1610 by the Italian physicist, mathematician and astronomer Galileo Galilei (1564-1642). These pioneering observations were made with the telescopes that Galileo had built in 1608. Galileo saw that the terminator (the line between the Moon's night and day sides) was sometimes irregular and sometimes smooth. He deduced that the irregularities were due to mountains on the Moon, the first time Earth-like objects had been discovered in the heavens. This challenged the existing worldview that said the heavens were perfect and unchanging. Sketch from 'Sidereus Nuncius' (March 1610).

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