The first images from ESA's proba 3 technology mission have been released and they are very fucking neat. Proba-3 creates an artificial eclipse using two spacecraft flying in incredible formation flying precision about 150 meters apart. The forward spacecraft is a big disk which blocks the Sun, allowing the second spacecraft to image the faint solar Corona. Previous coronagraphs blocked the Sun using internal optics, but this is limited by the physical size of the occulter, which means Proba 3 can see much closer to the Solar surface.

The resolution is crazy. It's unintuitive because the shadow is blurry, but if you zoom in you can see this incredible structure only really seen in eclipses before.

Formation flying is a key technology to looks of cool shit, like starshades to image earth-like exoplanets, or huge interferometer arrays to get huge jumps in telescope resolution. It has never been demonstrated at this level of precision.

There are other images in the link.

https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Proba-3/Proba-3_s_first_artificial_solar_eclipse