Ring discovered around dwarf planet Quaoar confounds theories

Astronomers find ring much further away from planet than is normal, leaving them wondering how it remains stable

Astronomers have spotted a ring around a Pluto-sized dwarf planet called Quaoar in the outer reaches of the solar system.

The observations, by a powerful telescope on La Palma, reveal the ring to be much further away from the planet than is typical, calling into question how such systems form.