12 août 2015
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Jean Dalibard, « Atoms and Radiation », La lettre du Collège de France, ID : 10.4000/lettre-cdf.1919
At the start of the seventeenth century, German astronomer Johannes Kepler sought to understand a mysterious phenomenon: comet tails, celestial objects claimed to have supernatural properties, always point away from the Sun. When a comet goes towards the Sun, it resembles hair floating in the wind. But when the comet moves away from the Sun, the tail comes before the nucleus, which seems counter-intuitive. Kepler sought to explain this phenomenon with the following proposition: “A comet’s t...