NASA's proposed Early eVolution Explorer mission aims to solve the radius valley mystery

A debate has been raging among planetary scientists for more than a decade-why are there so few exoplanets with a radius of about 1.8 times that of Earth? Exoplanets are currently largely grouped into two distinct categories-"super-Earths" are below that size and have rocky interiors, whereas "sub-Neptunes" are above that size limit and appear puffier. But researchers don't really understand why the path of planetary evolution forces this bifurcation. A new mission proposal, ...