Triton as an archetype for icy ocean worlds: Key scientific drivers for future exploration.

Ocean worlds (a subset of icy satellites) are among the most promising targets in the search for extraterrestrial habitability and biosignatures. Triton stands out due to its capture from the Kuiper Belt, geological activity, and potential subsurface ocean. This article reviews global efforts in icy satellite exploration and identifies three key scientific themes for Triton: Subsurface Ocean and Habitability, Extent of Interior-Surface-Atmosphere Coupling, and Dynamic Space Environment. We assess the current state of knowledge and highlight critical unresolved questions for future missions. By analyzing the Neptune-Triton system and emerging trends in planetary exploration, we propose scientific investigations and recommendations for future exploration of Triton. Payload requirements are outlined to investigate Triton's potential habitability, subsurface ocean, atmosphere, and surrounding space environment. A comprehensive, multi-instrument, and potentially multi-platform approach is essential to achieve transformative discoveries. This synthesis provides a scientific framework to guide future exploration, particularly informing the planning of China's upcoming deep space missions to ocean worlds.