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This white paper proposes that AMBITION, a Comet Nucleus Sample Returnmission, be a cornerstone of ESA's Voyage 2050 programme. We summarise some ofthe most important questions still open in cometary science after the successesof the Rosetta mission, many of which require sample analysis using techniquesthat are only possible in laboratories on Earth. We then summarisemeasurements, instrumentation and mission scenarios that can address thesequestions, with a recommendation that ESA select an ambitious cryogenic samplereturn mission. Rendezvous missions to Main Belt comets and Centaurs arecompelling cases for M-class missions, expanding our knowledge by exploring newclasses of comets. AMBITION would engage a wide community, drawing expertisefrom a vast range of disciplines within planetary science and astrophysics.With AMBITION, Europe will continue its leadership in the exploration of themost primitive Solar System bodies.

AMBITION -- Comet Nucleus Cryogenic Sample Return (White paper for ESA's Voyage 2050 programme)