Willem de Sitter

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Noun1.Willem de Sitter - Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934)
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The concept is named after Willem de Sitter, a Dutch physicist who worked closely with Einstein in the 1920s in Leiden on the space-time structure of the universe.
Later work by Willem de Sitter and independently by Aleksandr Friedmann implies the possibility that the universe is expanding.
Shortly after Einstein published his general relativity theory, the Dutch physicist, Willem de Sitter, solved the general relativity equations without Einstein's cosmological constant to describe what appeared to be a static unchanging universe.