scientists around the world immediately try to figure out how to make things work. a select few will be allowed to live, the rest will riot, be drunk, commit suicide, etc. all resources on the planet will be devoted to being able to self-heat ourselves, giving a purpose to a LOT of the nukes we have in order to buy time and figure out a remedy/destroy the planet ourselves.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.