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Speaking of gigantic solar flares, one is predicted (by science!) to come pretty soon. If it's on the same level as the one that happened back in the late 1800s, it could have quite dire consequences. Blackouts lasting for months, machinery catching fire, no communication, hospitals nooot doing so good, and so forth.
Earth will of course be completely stripped of its life and in time vaporize completely when the sun grows too big in a couple billion years, but at the moment there's not much to worry about there, haha.