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How long can humans survive without sun?
Photosynthesis would cease in the absence of sunlight, but this would only kill some plants—some bigger trees may exist for decades without it. Temperatures would begin to decrease within a few days, and any humans remained on the planet’s surface would perish quickly.
A relatively simple calculation would show that the Earth’s surface temperature would drop by a factor of two about every two months if the Sun were shut off. The current mean temperature of the Earth’s surface is about 300 Kelvin (K). This means in two months the temperature would drop to 150K, and 75K in four months.
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