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
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, 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, explainsthan others by placing fresh emphasis on their histories. Now, Walker and her colleagues are testing the theory on lab-grown microworlds.
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