Caption: Shimmering coronal loops from Active Region 1515 on the limb of the Sun before it rotates out of view on July 12, 2012. Credit: NASA/SDO/Goddard Spaceflight Center What takes place on the Sun before it unleashes a huge solar flare? It’s a thing of beauty, and observations from the Solar Dynamics Observatory are helping … Continue reading "Prelude to an X-Class Solar Flare"