Humans have long been interested in the possibility of extraterrestrial life. This hour, a look at why that interest has persisted.

Plus, we talk to a scientist who is looking for extraterrestrial life and a linguist who is preparing in case we ever receive communications from extraterrestrials.

GUESTS:

• Kate Dorsch: Historian, philosopher of science, and the associate director of the philosophy, politics, and economics program at the University of Pennsylvania
• Amanda Rees: Historian of science based at the University of York
• Seth Shostak: Senior astronomer at the SETI Institute and host of the radio show and podcast Big Picture Science
• Sheri Wells-Jensen: Associate professor of English and linguistics at Bowling Green State University who is on the board of directors of METI International

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Colin McEnroe and Cat Pastor contributed to this show.