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In this image obtained February 16, 2011 from NASA, a pair of active regions on the Sun put on quite a show over a three-day period (February 7-10, 2011), as seen in extreme ultraviolet light from the Solar Dynamic Observatory (SDO) spacecraft. The magnetic field lines above the regions produced fluttering arcs waving above them as well as a couple of flares. Another pair of smaller active regions emerges and trails behind the larger ones. AFP PHOTO / NASA