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Proba-3 is designed to be "An Eclipse Machine." Its twin spacecraft will fly 150 meters apart, carefully aligned, one serving as an artificial moon, the other the observer. The long distance between observer and occulter will make Proba-3 the most efficient coronagraph ever built by humankind.
Instead of the 7-minute-long observations provided by natural eclipses, the Proba-3 formation will block out the sun for up to six hours at a time. Not relying on serendipitous timing, the satellite and its occulter will be there to capture the most powerful solar flares and coronal mass ejection as they happen.
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