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This planet is "Nemesis". If you are an Asimov fan, you know why. Damn he was eerily prescient about this one.

The planet in Nemesis had one major difference which may turn out to be crucial: it was not actually a planet. It was a moon. Since Proxima b is a planet, it is probably locked with one side always facing the sun. In Nemesis, Erythro was locked around the gas giant it was orbiting, but not locked around the star, allowing normal day-night cycle.

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