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Planetary Perils in Prague [01:02:18]
@ Museum of Science (2007-04-04)
tags: astronomy science [add tags]
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From the WGBH Forum Network: "Around 150 AD, a Greek mathematician and sky watcher imagined that Earth was the center of the Universe and that the five visible planets traveled about our world. Thirteen hundred years later, a Polish astronomer revised our understanding of the cosmos and created the notion of a solar system, where Earth and the other planets traveled about the Sun. By the end of the twentieth century it was common knowledge that there were nine planets in our solar system. Last year, a group of international astronomers gathered in Prague and reorganized our understanding of our solar system. Pluto was put into category different from the other planets. Gingerich explains how this happened. "
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