Cosmos: A Sketch of a Physical Description of the Universe is an influential treatise on science and nature written by the German scientist and explorer Alexander von Humboldt. Cosmos began as a lecture series delivered by Humboldt at the University of Berlin, and was published in five volumes between 1845 and 1862 (the fifth was posthumous and completed based on Humboldt’s notes). In the first volume of Cosmos, Humboldt paints a general “portrait of nature”, describing the physical nature of outer space and the Earth. In the second volume he describes the history of science.

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