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More than a decade ago, Hollywood director Roland Emmerich made a movie called The Day After Tomorrow, which was about the earth experiencing extreme weather changes, resulting in a sudden temperature drop. Suddenly this doesn't look quite so fanciful. In a new report, researchers have warned that the Earth could be headed for a “mini ice-age” in 2030.

And this time it won't be a polar vortex or even climate change to blame. Instead, the sun's solar cycle is at fault here. Our sun is believed to have an 11-year cycle of solar activity, hitting a trough and a peak over the course of that time, usually with attendant sun spots. From 2010-15, the solar cycle was supposed to have been at a maximum, explaining the current heat waves across the world. By 2030, however, researchers have speculated the solar cycle will hit its minimum. That means, the world is going to be coldest during that time and the weather could be so cold that it could freeze an entire river. Though, the duration of such “mini ice-age” is still uncertain the report expects it between 2020 and 2030.

This video from NASA's explains just how solar cycles work, and why we might need to be worried about the next decade.