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A view of the sun taken by 'Ahead,' one of NASA's twin Solar Terrestrial Relations Observatory (STEREO) spacecraft, is seen in this Sept. 26 photograph. The twin STEREO spacecraft, called 'Behind' and 'Ahead' denoting their relative positions in space, captured a large and dramatic prominence eruption over about a 30-hour period when the crafts were 120 degrees apart. Prominences, called filaments when they are viewed against the surface of the Sun, are clouds of cooler gas suspended above the Sun's surface by magnetic forces.

PHOTO: NASA/REUTERS

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