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metal prints terminator metal prints mountain metal prints space metal prints book metal prints moon metal prints notes metal prints paper metal prints mare metal prints history metal prints astronomy metal prints history of science metal prints sketch metal prints monochrome metal prints black-and-white metal prints 17th century metal 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. Sketches 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. Page from 'Sidereus Nuncius' (March 1610).

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