Atmosphere detected on a distant Kuiper belt object during stellar occultation

A three-site stellar occultation of the ~250-km-radius trans-Neptunian object 2002 XV93 on 2024-01-10 revealed a refractive signature indicating a thin atmosphere with surface pressure around 100–200 nanobars, marking the first atmospheric detection beyond Pluto for a body of this size. This shows that even relatively small, distant icy worlds can host transient atmospheres, potentially sustained by cryovolcanic activity or a recent impact, and challenges standard ideas about volatile retention in the outer Solar System.