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Large Eruptive Prominence Imaged by STEREO

Last week, our Sun produced one of the largest eruptive prominences ever seen. NASA's twin Sun-orbiting STEREO satellites captured this event in movie form. A quiescent solar prominence is a cloud of hot solar gas held above the Sun's surface by its magnetic field. These prominences can unpredictably erupt, expelling hot gas into the Solar System via a Coronal Mass Ejection.