"De Sitter made observations in 1913 of double-star systems and became the first astronomer to prove that the velocity of light had nothing to do with the velocity of its source. ...De Sitter ...published three papers entitled "On Einstein's Theory of Gravitation and Its Astronomical Consequences. The first two... explained Einstein's theories, and the third proposed his own interpretation of the astronomical consequences... de Sitter and Einstein published a joint paper in which they proposed there may be in the universe large amounts of matter that does not emit light and consequently has not been detected. This became known as "dark matter"..."
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CosmologistsAstronomers from the NetherlandsPhysicists from the NetherlandsMathematicians from the Netherlands
Original Language: English
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Deborah Todd, Joseph A. Angelo, A to Z of Scientists in Space and Astronomy (2009)
https://en.wikiquote.org/wiki/Willem_de_Sitter
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Willem de Sitter
Willem de Sitter (6 May 1872 – 20 November 1934) was a Dutch mathematician, physicist, astronomer and cosmologist who applied the general theory of relativity to the early investigation of the structure of the universe.
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