The European Space Agency (ESA)'s CHaracterizing ExOPlanet Satellite (Cheops) mission has observed a dwarf planet in our Solar System, contributing to the discovery of a dense ring of material around it. The mission discovered that the Dwarf Planet Quaoar had a ring of almost seven and a half times the radius of the Dwarf Planet. This consequently opens up a mystery for astronomers; why has this material not coalesced into a small moon?
