Faulkner and the Native Keystone

The nature and origins of sub-Neptune size planets

“…Helium is a more promising species from this standpoint because it would only exist in large quantities for a primary atmosphere that was accreted from the protoplanetary nebula. However, the most observable helium feature, the infrared triplet, arises from a metastable state that requires a finely tuned spectrum of UV irradiation from the host star to be populated (Oklopčić, 2019).…”