How long would humans survive without the sun?

Without the Sun, Earth would lose its primary source of energy, and temperatures would rapidly drop. While it's challenging to provide an exact timeframe, most estimates suggest that humans would not survive for more than a few weeks without the Sun's warmth and energy. The lack of sunlight would lead to extreme cold, making the planet uninhabitable for complex life forms, including humans.

If the Sun were to suddenly disappear, the immediate impact on Earth would be catastrophic. The most immediate consequence would be the absence of sunlight, plunging the planet into darkness. The Earth's surface temperature would rapidly drop, reaching temperatures far below freezing within a matter of days. Without the Sun's gravitational pull, the Earth would no longer be held in its orbit, resulting in a straight-line motion. However, this change in orbit wouldn't be an immediate concern compared to the sudden loss of warmth and light.

As the temperature plummeted, the effects on the biosphere would be devastating. Plants, which rely on photosynthesis to produce food, would be unable to survive without sunlight, leading to a collapse in the entire food chain. Herbivores would face a scarcity of food, and carnivores would subsequently suffer from the decline in herbivore populations. The domino effect would extend to humans, as the disruption of ecosystems and the scarcity of resources would make it impossible for our species to sustain itself.

Beyond the environmental impacts, the lack of sunlight would have profound effects on human health. Vitamin D, synthesized in the skin through exposure to sunlight, is crucial for various bodily functions. The absence of sunlight would result in widespread vitamin D deficiencies, leading to weakened immune systems, bone disorders, and other health complications. In summary, the sudden disappearance of the Sun would trigger a chain reaction of environmental, ecological, and health crises, ultimately rendering Earth uninhabitable for humans within a relatively short period.