Johannes Kepler
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Johannes Kepler (lived December 27, 1571 – November 15, 1630) was a German astronomer. He was Tycho Brahe's apprentice, or person who learns a trade from another person. He looked at the solar system and discovered three laws about how it works. The first was that the orbits, or paths, of planets are "ellipses", or flattened ovals that really have two "centers". The second was that if there was a line between a planet and the Sun, the line would sweep an equal area in equal amounts of time. The third was that if a person multiplied the time it took for a planet to go around the Sun by itself, that person would get the distance of a planet to the Sun multiplied by itself twice.
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