JWST Sheds New Light on Mysterious ‘Sub-Neptune’ Worlds

This artist’s concept of hot sub-Neptune exoplanet TOI-421 b. Illustration: NASA, ESA, CSA, Dani Player (STScI)

In a groundbreaking study that could transform our understanding of planetary systems beyond our own, NASA’s James Webb Space Telescope has offered an unprecedented glimpse into the atmosphere of a curious and poorly understood class of exoplanets known as sub-Neptunes. Sub-Neptunes — planets larger than Earth but smaller than Neptune — don’t exist in our … Read more