In the cold reaches between Saturn and Uranus, a small icy world named Chariklo has quietly dismantled one of astronomy's long-held assumptions. The James Webb Space Telescope has found that the two narrow rings encircling this 250-kilometre centaur are not the frozen, unchanging relics scientists expected, but dynamic structures visibly shifting on timescales of mere years. In forcing us to reckon with rings around a body smaller than Tasmania, Chariklo invites a deeper question: how much of what we call stable is simply change we have not yet had the patience to witness?
James Webb detects rapid changes in rings around tiny icy body Chariklo
Science & Space