A trans-Neptunian object was found to possess a surprising thin atmosphere after astronomers witnessed the object occult a distant star.

A tiny 'plutino' world beyond Neptune has grown a mysterious atmosphere, and we don't know how

Source: space
Source Link: https://www.space.com/astronomy/solar-system/scientists-find-tiny-object-in-our-solar-system-with-a-mysterious-atmosphere-that-shouldnt-exist