NASA's EVE mission targets exoplanet radius valley mystery

Astronomers observe a radius valley: many rocky super-Earths and sub-Neptunes, but few planets at 1.8 Earth radii. NASA's proposed EVE mission would study planets younger than 50 million years in young star clusters to determine if the gap comes from atmospheric stripping or formation differences. The mission would monitor 30 fields for 30 days each over 2.