Is there life in the universe beyond planet Earth? It's the question everyone, including Alan Alda, wants to understand. In this episode, Alan asks Dr. Lisa Kaltenegger, the head of the world-renown Carl Sagan Institute, about life in the cosmos. What Dr. Kaltenegger has to say is surprising and inspiring. Before you stare up at the sky tonight, be sure to hear what Dr. Kaltenegger has to say about which of the billions of planets might be more like ours than we ever thought possible.

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