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.
Solar Eclipses on Demand: Proba-3’s Precision Satellites Enter Orbit
Behind the Cosmic Veil: Proba-3’s Pioneering Solar Eclipse Technology
