Scientists call them “belatedly habitable planets”: worlds that enter their star’s habitable zone only after formation. Around M dwarfs, some may first endure hundreds of millions of years of intense radiation that splits atmospheric water and drives its hydrogen into space, leaving them dry before temperate conditions finally arrive.
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A planet can occupy the habitable zone and still have arrived too late. That is the point behind the phrase belatedly habitable planet. The habitable zone moves as a star changes, so a world that is… [+12732 chars]