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Galileo Galilei was an Italian astronomer and physicist who lived between 1564-1642. He was the first person to use a telescope to look at the heavens, and discovered craters in the moon. Galileo found...more
Johan Kepler was a German astronomer who lived between 1571-1630. Kepler used Tycho Brahe's observations of Mars to show that planetary orbits are not circular, but, in fact, elliptical (or shaped like...more
Henrietta Swan Leavitt was born in Massachusetts in 1868. She became interested in astronomy in college. Henrietta started working at Harvard's Observatory for 30 cents an hour. Would you like to work...more
Archimedes was a Greek mathematician and engineer who lived between 287-212 B.C. His greatest contributions are in the field of geometry, where he did much work with circles and their properties. Legend...more