After Solar Orbiter, ESA’s next mission observing the sun will not be one spacecraft but two: the double satellites making up Proba-3 will fly in formation to cast an artificial solar eclipse, opening up the clearest view yet of the sun’s faint atmosphere—probing the mysteries of its million degree heat and magnetic eruptions.
Source:
https://phys.org/news/2020-02-esa-sun-mission-shadow-casting-pair.html