| NOUN | person | Willem de Sitter, Sitter | Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934 ) |
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| Meaning | Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934 ). | |
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| Synonym | Sitter | |
| Instance of | astronomer, uranologist, stargazer | A physicist who studies astronomy |