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Many planets that have the right temperatures for liquid water on their surfaces used to be too hot or too cold, which may affect their ability to host life now
Space 19 January 2023By Leah Crane
Two planets orbiting a red-dwarf star (illustration) NASA/JPL-Caltech
A large proportion of planets in the so-called habitable zone – the area in orbit around a star where conditions are right for liquid water on a world’s surface, and thus potentially for life – weren’t always there. That might mean that we’re vastly overestimating the number of worlds that could host life.
While researchers often think of the habitable zone of any given star as being relatively static, it actually changes as the star evolves and its brightness and temperature changes. That …
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