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Since outer space has a temperature of about 3 K (-273 °C), the planets cannot be any colder, so if you can live there (the ISS) you can live anywhere. But as far as survivable temperatures for humans, only Earth qualifies. The next closest is Mars, which would need less heat to make habitable. The polar zones of Mercury have bearable surface temperatures as well, but they exist in a hard vacuum (as with space).

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Q: What is the coldest planet humans can live on?
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