On July 26, a retired American air force intelligence officer claimed that the U.S. is hiding knowledge about unidentified flying objects, or UFOs. The recent news got us thinking: Is it possible that aliens could exist? If so, what might they look like? How likely is it that there's other life in the universe?  KN contributor Ainara Alleyne spoke to a scientist from NASA's Exoplanet Exploration Program and a UFO researcher to find out what the scientists know and what's still unknown. Original broadcast date: August 8, 2023.

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