A 2024 occultation indicates that the 500-kilometre trans-Neptunian object 2002 XV93 carries a 100-to-200-nanobar atmosphere, but neither an impact nor continuing outgassing has been demonstrated.
A body only about 500 kilometres wide, circling in the deep cold beyond Neptune, appears to possess an atmosphere. That sentence is difficult to reconcile with the world’s weak gravity, and the team … [+11295 chars]