Credit: STEREO Project, NASA
Explanation:
What's happened to our Sun? Last week, it produced one of the largest eruptive
prominences ever seen. Pictured above, the prominence erupted in only a few
hours and was captured in movie form by NASA's twin Sun-orbiting STEREO
satellites. A quiescent solar prominence is a cloud of hot solar gas held above
the Sun's surface by the Sun's magnetic field. Unpredictably, however,
prominences may erupt, expelling hot gas into the Solar System via a Coronal
Mass Ejection (CME). As pictured above, many Earths would easily fit under the
expanding ribbon of hot gas. Although somehow related to the Sun's changing
magnetic field, the energy mechanism that creates and sustains a Solar
prominence is still a topic of research.
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