Coronal mass ejections (or CMEs) are large clouds of charged particles that are ejected from the Sun over the course of several hours and can carry up to ten billion tons (1016 grams) of plasma. They expand away from the Sun at speeds as high as a million miles an hour. A CME can make the 93-million-mile journey to Earth in just three to four days. At the time of this snapshot taken on Friday, March 12, the eruptive prominence was over 700,000 km (420,000 miles across), over 50 times the Earth's diameter. That's like measuring the length of 50 Earth's standing side-by-side! Even more, the plasma was moving at a rate of over 75,000 km per hour (50,000 mph).(Text and Photo: NASA/SDO)
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