In 1992, NASA brought together some scientists to make plans about how the agency should go look for life on other planets. They said that life is a self-sustaining chemical system capable of Darwinian evolution. "I feel like each of those definitions could probably use about 10 minutes of unpacking," he says.
For every definition of life, there’s a creature that sends us right back to the drawing board.
This is the third episode in our three-part series, Origins, about the beginnings and boundaries of life on Earth.
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