Clear Skies, Strange Chemistry: Webb Just Changed What We Know About Sub-Neptunes

Scientists Determine Atmospheric Makeup of Small, Hot, Gassy Sub-Neptune Planet Sub-Neptunes, planets smaller than gas giants and cooler than hot Jupiters, have long been elusive targets for astronomers. Despite being the most common type of exoplanet in our galaxy, they don’t exist in our own solar system, and until recently, we knew very little about [...]