Went Out
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Reba McEntire- The Night the Lights Went Out in Georgia
How long could we live if the Sun went out?
We would still have electricty...
Sooo...If the sun went out tomorrow, how long could we survive? What would kill us in the end?
The only two things I can come up with are that we would freeze to death, and that eventually we would run out of oxygen because the trees wouldn't have the sunlight needed to produce it.
Well, wherever you live, think how much the temperature drops between sunset and dawn. It would just keep dropping at pretty much the same rate...or faster as water vapor froze out and all the clouds disappeared.
So at higher elevations and colder areas the surface would be a frozen uninhabitable wasteland in days. Within a week everywhere on Earth would be too cold for life as we know it. Virtually all humans, plants, and animals would be dead.
So yes, the cold would be what kills us first. Life would survive, especially microbial life. Seafloor vent colonies might also survive, the oceans would freeze over but likely the Earth's geophysical heat (tides, radioactive decay, volcanism) would keep them from freezing completely solid.
At some point most of the air would freeze and fall to the ground as snow. Probably in colored layers as different components froze out as it got colder. The clear air would yield spectacular star filled skies, but the Moon would be just dim shadow with no phases as it would only be illuminated by starlight.
Some humans might survive in protected bunkers and the like, but their long term prospects would be poor unless there were a lot of them and they were very well equipped and prepared.
