arxiv.org/abs/2601.05090 Surveying exogenous species in Saturn with ALMA I. Detecting and Mapping CO
ALMA observations of Saturn's limb from 20°S to 69°N show stratospheric carbon monoxide confined to a thin layer between 0.1 and 1 mbar. Its even spread and lack of an equatorial enhancement point to a cometary impact within about 200 years, not steady ring infall.
— via arXiv — Physics, Deborah Bardet, Thierry Fouchet, Thibault Cavali'e, Rapha"el Moreno, Emmanuel Lellouch, Camille Lefour, Bilal Benmahi, Sandrine Guerlet
