#author("2022-11-18T02:58:03+09:00","","")
Helium-enhanced planets along the upper edge of the radius valley - Nature.com
Exoplanets with radii between 1.4 and 2.5 R⊕ may have atmospheres strongly enhanced in helium after a few billion years, due to the preferential loss of hydrogen over helium via photoevaporation. 
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