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Why Did Pluto Get the Boot? Pluto is no longer one of the nine planets of the solar system. Instead, astronomers say it should officially be considered a dwarf planet, while the solar system should encompass the eight classical planets. We'll look at the scientific thinking behind the decision.

Opinion

Space

Why Did Pluto Get the Boot?

Heard on Talk of the Nation

Why Did Pluto Get the Boot?

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Pluto is no longer one of the nine planets of the solar system. Instead, astronomers say it should officially be considered a dwarf planet, while the solar system should encompass the eight classical planets. What's the scientific thinking behind the decision?

Guest:

David Kestenbaum, science correspondent, National Public Radio