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Hello, cousin? Aliens could look a lot like earthlings, Oxford study suggests

From gaseous clouds to giant cockroaches, aliens have taken countless shapes in science fiction, but now there’s reason to believe that extraterrestrial life-forms may actually look a lot like earthlings. That’s the conclusion of a new study conducted by researchers at Oxford University, who for the first time have provided evidence to show how evolutionary theory — and mechanisms like natural selection — can better help predict the appearance and behavior of potential otherworldly neighbors.

“A fundamental task for astrobiologists (those who study life in the cosmos) is thinking about what extra-terrestrial life might be like,” said Sam Levin, a researcher in the Oxford Department of Zoology, who lead the study. “But making predictions about aliens is hard. We only have one example of life — life on Earth — to extrapolate from. Past approaches in the field of astrobiology have been largely mechanistic, taking what we see on Earth, and what we know about chemistry, geology, and physics to make predictions about aliens.”

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Levin and his team instead used evolutionary theory to predict the appearance of aliens, independent from the shape of life-forms on Earth. “This is a useful approach,” he said, “because theoretical predictions will apply to aliens that are silicon based, do not have DNA, and breathe nitrogen, for example.”

The results are some otherworldly creatures that look surprisingly familiar.

‘The Octomite’ is a complex alien make up of a hierarchy of entities that form a mutually dependent symbiotic relationship. Image used with permission by copyright holder

To be sure, the researchers admit they can’t yet predict whether aliens are green, bipedal, big-eyed beings or something else entirely, but they hope their study helps establish evolutionary theory as a lens through which to imagine what aliens might look like.

“By predicting that aliens have undergone major transitions — which is how complexity has arisen in species on Earth — we can say that there is a level of predictability to evolution that would cause them to look like us,” Levin said.

With the aid of evolutionary theory, the researchers’ predict that aliens would be made up of a hierarchy of increasingly complex entities and mechanisms (much like molecules, cells, and organisms) that cooperate in the form of a larger being. “At each level, of the organism there will be mechanisms in place to eliminate conflict, maintain cooperation, and keep the organism functioning,” Levin said. “We can even offer some examples of what these mechanisms will be.”

A paper detailing the research was published this week in the International Journal of Astrobiology.

Dyllan Furness
Former Contributor
Dyllan Furness is a freelance writer from Florida. He covers strange science and emerging tech for Digital Trends, focusing…
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