NASA / SDO / SCIENCE PHOTO LIBRARY NASA / SDO / SCIENCE PHOTO LIBRARY
Solar activity. Extreme ultraviolet (UV) satellite image of the Sun, showing cascading loops of plasma following a solar flare eruption on 15th January 2012. These loop structures are made of superheated plasma, just one of which is the size of several Earths. Imaged by NASA's Solar Dynamics Observatory (SDO).
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