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Currently the smallest known exoplanet is COROT-Exo-7b discovered by the French COROT mission. (previously) Both the COROT and Kepler missions use the planetary transit method of detection, where a planet crossing the face of a star causes a dip in its brightness.
Astronomer Tycho Brahe was one of the more colorful characters of the scientific Renaissance. He lost his nose in a duel; flouted the rules of Danish nobility and married a commoner; built, on the island of Hven, Uraniborg, the best astronomical observatory of his day; kept a beer-drinki...