2min chapter

Unexplainable cover image

Origins: The meaning of “life”

Unexplainable

CHAPTER

Definitions of Life

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.

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