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At the edge of the solar system is a planet surrounded by “impossible” rings. It’s a dwarf planet called Quaoar, discovered in 2002, which has a ring system at an anomalous distance previously thought impossible. The discovery, published in the journal Nature, prompts us to reconsider current theories of how rings form around planets. The images were taken by several ground-based telescopes and by the European Space Agency (ESA) Cheops satellite, in which Italy is a major [...]