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Swedish astronomer who devised the centigrade thermometer (1701-1744) Anders Celsius , Celsius
ancient Greek astronomer who was one of the first to propose a heliocentric theory of the universe (circa 270 BC) Aristarchus of Samos
United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907) Asaph Hall , Hall
astronomer who studies the physical properties of celestial bodies astrophysicist
Danish astronomer whose observations of the planets provided the basis for Kepler's laws of planetary motion (1546-1601) Brahe , Tycho Brahe
Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed until Copernicus (2nd century AD) Claudius Ptolemaeus , Ptolemy
United States astronomer who discovered the planet Pluto (1906-1997) Clyde Tombaugh , Clyde William Tombaugh , Tombaugh
Polish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543) Copernicus , Mikolaj Kopernik , Nicolaus Copernicus
astronomer who studies the evolution and space-time relations of the universe cosmologist
United States astronomer said to have built the first telescope made in America; also the first director of the United States Mint (1732-1796) David Rittenhouse , Rittenhouse
English astronomer remembered for his popular elucidation of relativity theory (1882-1944) Eddington , Sir Arthur Stanley Eddington
English astronomer who used Newton's laws of motion to predict the period of a comet (1656-1742) Edmond Halley , Edmund Halley , Halley
United States astronomer who discovered that (as the universe expands) the speed with which nebulae recede increases with their distance (1889-1953) Edwin Hubble , Edwin Powell Hubble , Hubble
astronomer almanac ephemeris
Greek mathematician and astronomer who estimated the circumference of the earth and the distances to the moon and sun (276-194 BC) Eratosthenes
United States astronomer who discovered that sunspots are associated with strong magnetic fields (1868-1938) George Ellery Hale , Hale
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