https://www.theregister.co.uk/2018/11/08/parker_solar_probe/

NASA’s Parker Solar Probe has kept its cool, successfully surviving sweltering temperatures to reach its first close encounter with the Sun, coming within 15 million miles of the solar surface.

Launched in August, the spacecraft is on a mission to study the star at the center of our Solar System. The goal is to help scientists crack the coronal heating problem - why is the corona, a ring made from extending threads of plasma visible during total solar eclipses, hotter than the star’s surface?