THEO is a feasibility study for a New Frontiers class orbiter mission to Enceladus that would directly sample its south pole water plumes in order to study its internal habitability and to search for biosignatures. Specifically, it would take advantage of the direct sampling opportunities of a subsurface ocean. The study concept was produced by the 2015 Jet Propulsion Laboratory Planetary Science Summer School under the guidance of TeamX. The study has not yet been formally proposed for funding.

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