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Life, But Not As We Know It

For sixty years, the search for life beyond Earth has been built on the single assumption that alien life will look enough like us to recognise. A radical new idea called Assembly Theory is challenging that assumption. A team from the Arizona State University has proposed applying it to the atmospheres of distant exoplanets, not to look for specific gases, but to measure how much complexity a planetary atmosphere contains, and whether blind chemistry alone could plausibly have produced it. If it works, it could transform the way humanity searches for life among the stars, and redefine what we are even searching for.

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