First off, to be clear, solar flares do not pose any threat to life on Earth. However, a massive solar flare could, and has, disrupted communications by knocking out or disorienting satellites. But ahead of the solar maximum in 2013 or 2014, sun-watchers have been observing the build-up of what could be an incredibly massive flare that could be headed our way.
According to NASA and astronomers around the world, absolutely massive solar flares, the likes of which haven’t been seen since the mid 1800s will whip Earth with “the force of 100 million hydrogen bombs”. Astronomers predict that the solar flares could be powerful enough to disrupt every single power grid on Earth simultaneously… which was only kind of a big deal when it happened in 1859, but could be devastating in the 21st century.