The story of Takahashi began in 1932 when Mr Kitaro TAKAHASHI created his sand casting factory. After the world war II, the factory made aluminium parts of optic instruments. So Mr Takahashi decided ...

Nous voilà parvenu au cœur du sujet, la théorie de la relativité, tout d’abord restreinte aux mouvements uniformes non accélérés. Quelques événement clés ont marqué l’enfance d’Einstein et ...

At the perihelion opposition, at 56 millions km from the Earth, a distance as short as 0.37 AU (1 A.U. = 149.56 million km), it takes 3 minutes and 7 seconds for a signal emitted by the DSN to reach ...