The Willem de Sitter reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Willem de Sitter

Willem de Sitter was a mathematician, physicist and astronomer born May 6 1872 in the city of Sneek in the Netherlands and died on November 20 1934.

De Sitter contributed to our concept of the universe. One of his accomplishments was to have co-authored a paper with Albert Einstein in 1932 in which they argued that there might be large amounts of matter which does not emit light, now commonly referred to as dark matter.

As well de Sitter was awarded the distinguished Bruce_Medal for his contributions to the field of astronomy.

See Also

• De_Sitter_universe
• De_Sitter_space
• De_Sitter_horizon

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