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

One In A Million!

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UC Berkeley SETI researcher Andrew Siemion and his colleagues have put an upper limit on the number of civilizations in our galaxy that are capable of giving us a call. He’ll explain their reasoning and provide other search updates.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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