Snaking Filament An elongated filament slithered, stretched and curled around the edge of the Sun as SDO watched in extreme ultraviolet light (Nov. 16-18, 2010). At one point it seems to break in two, but then it re-establishes its continuity. A second filament appears in the left part of the video clip and still too, though it is not as large or active. Filaments are relatively unstable clouds of cooler gases suspended above the Sun by magnetic forces. Sometimes they erupt and burst into space; other times they just fade away. Keep an eye on this one!