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A.
Topic What happened to Pluto？
Speaker Owen Gingerich Ph. D. , HarvardSmithsonian Center for Astrophysics.
Details By the end of the 20th century, it was common knowledge that there were nine planets in our solar system. However, a group of international astronomers reorganized our understanding of the solar system. Pluto was put into a category different from the other planets. Why did this happen？
Host Museum of Science, Boston
