NASAのインスタグラム(nasagoddard) - 7月17日 00時45分

A solar prominence erupted into space and seemed to create the Greek letter Pi as seen by NASA's Solar Dynamics Observatory, or SDO, on July 4, 2015. Pi is the symbol for the ratio of a circle's circumference.
Prominences, which are elongated clouds of plasma suspended above the sun's surface by magnetic forces, frequently become unstable and erupt. This one did blow a cloud of particles into space as observed by the ESA&NASA SOHO spacecraft, though our close-up shows that some of it fell back into the sun.

Credit: NASA/Goddard/SDO #nasagoddard #sun #space #pi

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