All of the definitions of life that we have—whether it’s “life is a self-reproducing system,” or “life eats to survive,” or “life requires compartments;” whatever it is—there’s always a counterexample that challenges that definition. This is why viruses are so hard or why fire is so hard. And so we’ve had a really hard time trying to pin down from a definitional perspective exactly what life is.

Physics of Life, Time, Complexity, and Aliens (2024)

Portrait of Sara Walker

Sara Walker

Theoretical Physicist and Astrobiologist

Sara Imari Walker is an American theoretical physicist and astrobiologist with research interests in the origins of life, astrobiology, physics of life, emergence, complex and dynamical systems, and artificial life. Walker is deputy director of the Beyond Center for Fundamental Concepts in Science at Arizona State University (ASU), associate director of the ASU-SFI Center for Biosocial Complex Systems and an associate professor at ASU. She is a co-founder of the astrobiology social network SAGANet, and on the board of directors for Blue Marble Space, a nonprofit education and science organization. As a science communicator, she is a frequent guest on podcasts and series, such as Through the Wormhole with Morgan Freeman.

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