Planetary Radio: Space Exploration, Astronomy and SciencePlanetary Radio: Space Exploration, Astronomy and Science

Planetary Radio 5th Anniversary Show: Astronomer Geoff Marcy on Discovery of Fifth Planet in Star System

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We celebrate our 5th anniversary by learning about discovery of a five-planet star system, the largest found so far. Q&A on Jupiter's red spot.Learn more about your ad choices. Visit megaphone.fm/adchoices

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Planetary Radio: Space Exploration, Astronomy and Science

Planetary Radio brings you the human adventure across our solar system and beyond. We visit each wee 
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