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Artist's impression of asteroid Chariklo Observations at many sites in South America, including the European Southern Observatory's La Silla Observatory, made the surprise discovery that asteroid Chariklo is surrounded by two dense and narrow rings. The origin of these rings remains a mystery, but they may be the result of a collision that created a disc of debris. ESO / L. Calçada / M. Kornmesser / Nick Risinger (skysurvey.org)