Fiche du document
12 août 2015
Ce document est lié à :
info:eu-repo/semantics/reference/issn/1628-2329
Ce document est lié à :
info:eu-repo/semantics/reference/issn/2109-9219
All rights reserved , info:eu-repo/semantics/openAccess
Sujets proches
Solar physicsCiter ce document
Jean Dalibard, « Atoms and Radiation », La lettre du Collège de France, ID : 10.4000/lettre-cdf.1919
Métriques
Partage / Export
Résumé
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...