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Proxima Centauri b is our closest known habitable-zone exoplanet, just over four light-years away, and it may be warm enough for liquid water if it has kept an atmosphere. But that “if” is enormous: i

Proxima Centauri b has a claim no other known exoplanet can match. It orbits the nearest star to the Sun, just over four light-years away, and it sits in the Proxima Centauri b has a claim no other known exoplanet can match. It orbits the nearest star to the Sun, just over four light-years away, and it sits in the kind of orbit where liquid water could exist on a rocky surface. That is the hopeful version... [6687 chars]

Proxima Centauri b is our closest known habitable-zone exoplanet, just over four light-years away, and it may be warm enough for liquid water if it has kept an atmosphere. But that “if” is enormous: i

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