We present a White Paper with a science theme concept of ocean world evolution and habitability proposed in response to ESA’s Voyage 2050 Call with a focus on Titan and Enceladus in the Saturn system. Ocean worlds in the outer Solar System that possess subsurface liquid water oceans are considered to be prime targets for extra-terrestrial life and offer windows into Solar System evolution and habitability. The Cassini-Huygens mission to the Saturn system (2004–2017) revealed Titan with its organic-rich evolving world with terrestrial features and Enceladus with its active aqueous environment to be ideal candidates to investigate ocean world evolution and habitability. Additionally, this White Paper presents a baseline for a multiple flyby mission with a focused payload as an example of how ocean world evolution and habitability in the Saturn system could be investigated building on the heritage of the Cassini-Huygens mission and complementing the recently selected NASA Dragonfly mission.

我们提出了一份白皮书，其中提出了海洋世界演化和宜居性的科学主题概念，以响应 ESA 的 Voyage 2050 Call，重点关注土星系统中的泰坦和土卫二。外太阳系中拥有地下液态水海洋的海洋世界被认为是外星生命的主要目标，并为了解太阳系的演化和宜居性提供了窗口。卡西尼-惠更斯号土星系统任务（2004-2017 年）揭示了土卫六具有地球特征的富含有机物的进化世界和土卫二具有活跃的水环境，是研究海洋世界演化和宜居性的理想候选者。此外，