One of the fastest coronal mass ejections, or solar flares, in years was captured by the STEREO COR1 telescopes on Aug. 1, 2010. This movie combines COR1-Ahead images with Helium II 304 Angstrom images from the STEREO EUVI telescope. It shows the rapid explosion of material outward, followed by a slower eruption of a polar crown prominence from another part of the sun. This CME headed toward Earth at speeds above 620 miles per second

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