Neil deGrasse Tyson - The Pluto Files

In this animated conversation, the always charismatic astrophysicist Neil deGrasse Tyson explains the reasons that Pluto recently got demoted from the status of a full-fledged planet to that of the first dwarf planet in the Kuiper Belt, the criteria that a celestial object must meet in order to count as a planet, the unexpected and intense reaction this news created, the political attempts by some to restore Pluto to what they see as its rightful place, and all the hate-mail he's received from third-graders...



Did you ever think you'd see third-graders get so worked up on a scientific topic?
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