... Europe after having collected detailed information of the star in 1572. He studied stars with the naked eye the next 20 years. Brahe's contributions were the great mass of data he had collected. He wasn't as good in mathematics though, but that he left for his assistant Kepler to do. Kepler formulated 3 famous laws of planetary motion. Planets are elliptical rather than circular around the sun. They do not move in a uniform motion. He showed that the time a planet takes to orbit Is precisely related to its distance from the sun. These laws were very important for the future. Copernicus had thoughts, and Kepler made them into laws. Galileo Galilei challenged the old ideas about motion. He was a poor noble-man. Became professor in maths. He conducted controlled experiments to find out what actually happened and did not speculate. Galileo went on to formulate the law of Inertia: An ...

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