If a powerful enough geomagnetic solar storm erupted from the surface of the Sun, it would be capable of knocking out communications across Earth for days, months, or even years. We likely wouldn't be harmed physically by such a calamity, but there's no telling how great the impact would be on the technology we use every day, scientists warned world leaders at a recent symposium on 'space weather' in Washington, DC last week.
There's no guarantee that such an event will happen while humans still walk the planet, but similarly powerful solar storms have occurred in the past – even relatively recently. The Solar Storm of 1859 – aka the Carrington Event – was caused by an intense solar flare hitting Earth's protective magnetosphere, causing telegraph systems across the US and Europe to break down (and even giving telegraph operators electric shocks).
The thing is, we weren't reliant on things like communications satellites, GPS, the internet, telephones, and air travel back then, and scientists estimate that if "the big one" hits us again, it could effectively send us back to the Dark Ages, technologically speaking. And given how much we depend on all that cool stuff these days, that might be something of a problem.
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