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Manx comets may provide key tests of solar system dynamical models. (a) Manx comets are perturbed inward from the Oort Cloud on long-period orbits. Credit EOS/L. Calcada. (b,c) Images of two Manx comets near perihelion showing extremely low-level activity, approximately 103 times less active than low-activity JF comets and 104–106 times less active than typical LP comets at similar distances. (Online version in colour.)
