The Search for ET Has an X-Factor: the Evolution of Stars

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To support life, a planet has to stay in its star’s “habitable zone.” But research on a nearby star shows that life-friendly zones won’t stay that way forever.

lies on the inner edge of the zone, but thanks to its veil of carbon dioxide, it’s blistering hot.

“If you're a bacterium, you can mutate rapidly and adapt to the situation,” says Seth Shostak, senior astronomer of the SETI Institute in Mountain View, California, named after. Other creatures might find better conditions in caves or underground. “If you’re an intelligent, more advanced species, you can do something about it,” he says, perhaps developing technologies that reflect lots of starlight or allow you to move out—or even move the planet.

Still, a world in the habitable zone might not turn into a rocky husk just because it gets hit by that radiation, Kane says. It might have gases stored in its interior that get vented out by geological activity, like volcanoes,as it’s eroded, according to his and his colleagues’ models. Even Earth underwent an early period of getting bombarded with lots of UV radiation, though it was not as intense as what red dwarfs generate.

 

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vardi Yeah. We have far less than a billion years to GTF Off Earth.

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