Why so sad, sun? NASA's Solar Dynamics (SDO) spacecraft has spotted the sun looking like a frowny face, thanks to a massive, dark line snaking across the sun's surface. Just check out the image below, which was snapped on Feb. 10, 2015.
(Story continues below image.) A solar filament, seen as a dark, snaking line across the lower half of the sun, hovers above the sun's surface.
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