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The first factor is distance from the sun. Most of the planets are too close or too far from the sun making them too hot or too cold. All the planets other than Earth have unbreathable atmospheres or, in the case of Mercury, no atmosphere. The four outer planets are gas planets with no solid surfaces.

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9y ago
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5mo ago

Planets can be uninhabitable due to extreme temperatures, lack of atmosphere, high radiation levels, toxic chemicals in the air or on the surface, and absence of liquid water. These factors can make it impossible for life as we know it to exist on such planets.

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Q: What makes planets unlivable?
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