Xploration Outer Space What Makes a Planet? (Season 3, Episode 13)
TV Episode | 22 min | Documentary, Family

Xploration Outer Space

What Makes a Planet? (Season 3, Episode 13)

TV Episode | 22 min | Documentary, Family

We'll explain why Pluto is no longer considered a planet, and why some scientists believe there is another planet in our solar system that hasn't been discovered yet. Host Emily Calandrelli looks at many objects that, regardless of ...See moreWe'll explain why Pluto is no longer considered a planet, and why some scientists believe there is another planet in our solar system that hasn't been discovered yet. Host Emily Calandrelli looks at many objects that, regardless of definition, look like new and fascinating planets. See less

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Cast	+ Add Cast
5 cast members

Name	Known for
Mike Brown Self - Professor of Planetary Astronomy, Caltech Self - Professor of Planetary Astronomy, Caltech See fewer	PBS News Hour (1975)
Emily Calandrelli Self - Host / Astronautics Expert Self - Host / Astronautics Expert See fewer	Xploration Outer Space (2014)
Mark Hammergren Self - Astronomer, Adler Planetarium Self - Astronomer, Adler Planetarium See fewer	Alternate Universe: A Rescue Mission (2016)
Marc D. Rayman Self - Director / Chief Engineer, Dawn Mission, JPL Self - Director / Chief Engineer, Dawn Mission, JPL See fewer	Ancient Aliens (2009)
Hal Weaver Self - Project Scientist, JHU Applied Physics Laboratory Self - Project Scientist, JHU Applied Physics Laboratory See fewer	Nova (1974)