Scientists have just spotted a strange circular filament wobbling around the sun's pole that has them really excited. A huge filament of solar plasma has broken off the sun's surface and is circling its north pole like a vortex of powerful winds, but scientists have no clue what caused it. "Talk about polar vortex! Material from a northern prominence just broke away from the main filament & is now circulating in a massive polar vortex around the north pole of our star," space weather forecaster Tamitha Skov said on Twitter while sharing a video sequence taken by NASA's Solar Dynamics...