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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Named after the Dutch astronomer Willem de Sitter, who worked with Einstein on the spacetime structure of the universe, anti-de Sitter space is quite different from a flat space.
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.