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New Planetary Discovery: Sedna

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New Planetary Discovery: Sedna

New Planetary Discovery: Sedna

New Planetary Discovery: Sedna

  • Download
  • <iframe src="https://www.npr.org/player/embed/1778701/1778702" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

A new planet is discovered — or is it a planetoid? It depends on whom you ask.

Guests:

Mike Brown
*Associate professor of planetary astronomy California Institute of Technology in Pasadena, Calif.