________________________________________________________________________________________________________________________________________________Johannes Kepler, the German astronomer of the 1500's, was the first to openly support Copernicus' Theory on the structure of the universe. Kepler was able to create three laws that summed up all of his findings.
2. An imaginary line from the center of the sun to the center of a planet sweeps out the same are in a given time. This means that planets move faster when they are closer to the sun.
3. The time taken by a planet to make one complete trip around the sun is its period. The squares of the periods of two planets are proportional to the cubes of their mean distances from the sun.
These laws proved indespensible when Isaac Newton was developing his own theories.