Alien life may evolve from radically different elements than human life did

Radioactive metals and even certain gases may be capable of the kinds of reactions needed to spur life, new research suggests.

Self-sustaining chemical reactions that could support biology radically different from life as we know it might exist on many different planets using a variety of elements beyond the carbon upon which Earth's life is based, a new study finds.

"One of the major reasons that origin-of-life researchers care about autocatalysis is because reproduction — a key feature of life — is an example of autocatalysis," Kaçar said."Life catalyzes the formation of more life. One cell produces two cells, which can become four and so on. As the number of cells multiply, the number and diversity of possible interactions multiplies accordingly.

To find these reactions, the scientists analyzed more than two centuries of digitized scientific documents written in many different languages."With effective language search and translation tools, we were able to design and conduct this first-of-its-kind assessment of the pervasiveness of autocatalytic cycles," study co-author Zach Adam, a geologist at the University of Wisconsin-Madison, told Space.com.

The researchers even discovered four autocatalytic cycles involving noble gases, which only rarely if ever chemically react with other elements. If even a relatively inert gas such as xenon could take part in autocatalysis,"there is good reason to guess that autocatalysis occurs more easily in other elements," Peng said.

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