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20th-century astronomers by nationality
20th-century American astronomers
20th-century Argentine astronomers
20th-century Australian astronomers
20th-century Austrian astronomers
20th-century Belgian astronomers
20th-century British astronomers
20th-century Canadian astronomers
20th-century Chinese astronomers
20th-century Danish astronomers
20th-century Dutch astronomers
20th-century French astronomers
20th-century German astronomers
20th-century Greek astronomers
20th-century Hungarian astronomers
20th-century Indian astronomers
20th-century Irish astronomers
20th-century Italian astronomers
20th-century Japanese astronomers
20th-century New Zealand astronomers
20th-century Polish astronomers
20th-century Russian astronomers
20th-century Spanish astronomers
20th-century Swedish astronomers
20th-century Swiss astronomers
Czechoslovak astronomers
Soviet astronomers
Yugoslav astronomers
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