Hundreds of millions of people will witness next week's total solar eclipse across North America, and solar physicists from around the globe are flocking to join them. Eclipses offer a brief glimpse of the sun's ghostly surrounding atmosphere—the solar corona—normally kept invisible by the sun's sheer glare. But the corona will soon be opened up for more sustained study: today in Belgium ESA has unveiled the pair of spacecraft making up its new Proba-3 mission, planned to produce orbital solar eclipse events on demand.
