Everything about Willem De Sitter totally explained
Willem de Sitter (
May 6 1872 –
November 20 1934) was a
Dutch mathematician, physicist and astronomer.
Born in
Sneek, De Sitter studied
mathematics at the
University of Groningen and then joined the
Groningen astronomical laboratory. He worked at the Cape
Observatory in
South Africa (1897-1899). Then, in 1908, de Sitter was appointed to the chair of astronomy at
Leiden University. He was director of the Leiden Observatory from 1919 until his death.
De Sitter made major contributions to the field of
physical cosmology. He co-authored a paper with Albert Einstein in 1932 in which they argued that there might be large amounts of matter which don't emit light, now commonly referred to as
dark matter. He also came up with the concept of the
de Sitter universe, a solution for Einstein's general relativity in which there's no matter and a positive
cosmological constant. This results in an exponentially expanding, empty universe. De Sitter was also famous for his research on the planet Jupiter.
De Sitter died
November 20,
1934 in
Leiden.
Aernout de Sitter
His son, Aernout de Sitter, was director of the
Bosscha Observatory in
Lembang,
Indonesia (then the Dutch East Indies), where he studied the
M4 globular cluster. He was captured by the
Japanese when they invaded at the outset of
World War II, and died in a
Sumatra labour camp in September of 1944
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Honours
Awards
Further Information
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