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How a radical redefinition of life could help us find aliens

June 20, 2023
in Science
How a radical redefinition of life could help us find aliens
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Life

Sara Imari Walker, who developed Assembly Theory with chemist Lee Cronin, explains how the theory’s definition of life might help us find it on other planets

By Thomas Lewton

New Scientist Default Image

Nabil Nezzar

What is life? It seems like a simple enough question. And yet the truth is that we can’t explain why one lump of matter is alive and another is not, which is a problem if you want to figure out how life on Earth began – never mind whether it exists elsewhere. But Sara Imari Walker, a theoretical physicist and astrobiologist at Arizona State University, has a radical new theory that purports to transform our understanding of what it is to be alive.

Most attempts to describe life use Earth as a blueprint. Instead, by pushing past cells and their chemistry to general principles about how complex objects come into existence, Walker claims to have reached a deeper understanding. The idea, known as Assembly Theory, explains why certain complex objects have become more abundant than others by placing fresh emphasis on their histories. Now, Walker and her colleagues are testing the theory on lab-grown microworlds. In experiments, they have already discovered a threshold – namely the number of steps on the way to complexity – that seems like it must be met for something to be considered alive.

If Assembly Theory proves correct, she tells New Scientist, it will redefine what we mean by “living” things and show that we have been going about the search for life beyond Earth all wrong. In the process, she says, we could even end up creating alien life in a laboratory.

Thomas Lewton: How do we define life at the moment?

Sara Imari Walker: A popular definition, often used by NASA, is that life is a self-sustaining chemical system capable of Darwinian evolution. Every word in …

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