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Is Earth unique, or are there other Earth-like planets full of life? If so, what might life be like on these other planets? Could we even detect it? These questions have puzzled people for millennia.

Now, we finally have the technology to explore it. Among the people who have taken up the search for other Earth-like planets and extraterrestrial life is today's guest, Lisa Kaltenegger!

Lisa Kaltenegger is an award-winning astrophysicist and astrobiologist and the founding director of the Carl Sagan Institute at Cornell. She is a pioneer and world-leading expert in modeling habitable worlds and their light footprints. For the last decade, she has been finding new ways to discover life in space, working with NASA and ESA from Austria to the Netherlands, Harvard, Germany, and now Cornell.