Looking for life in all the wrong places

Scientists have long focused their search for extraterrestrial life on Earth-like planets – but that may be a mistake, according to a McMaster researcher. Astrophysicist René Heller of McMaster’s Origins Institute says our planet may not be the most ideal place for life and scientists need to consider non-Earth-like, so-called “superhabitable” planets. These planets would probably be two or three times more massive and much less mountainous than Earth. They would probably be older, too.

“The Earth just scrapes the inner edge of the solar system’s habitable zone – the area in which temperatures allow Earth-like planets to have liquid surface water,” says Heller. “So from this perspective, Earth is only marginally habitable. That led us to ask: could there be more hospitable environments for life on terrestrial planets?”

Heller and co-author John Armstrong of Weber State University describe superhabitable planets in a paper published in the journal Astrobiology early in January. In it, they outline some of the characteristics such planets might have. They include many, shallower bodies of water (rather than a few large oceans), a more reliable global “thermostat” that impedes ice ages, and a magnetic shield, to protect the planet from cosmic radiation. Heller says the theory means astronomers should be aiming their telescopes at planets that have so far not garnered much attention in the search for extraterrestrial life.

“We propose a shift in focus,” he says. “We want to prioritize future searches for inhabited planets. We’re saying ‘Don’t just focus on the most Earth-like planets if you really want to find life.'” Via Looking for life in all the wrong places.

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