space.com: The sun just gave us a reminder of its immense might. Our star unleashed an X-class solar flare today (Dec. 14), blasting out an immense pulse of high-energy radiation that was captured on video by NASA's Solar Dynamics Observatory spacecraft. (Solar physicists classify strong flares into three categories, with C being the weakest, M the middling group and X the most potent.) The outburst, which occurred at 12:02 p.m. ES...

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