Detection of Organic Molecules in Ice Grains Ejected from Enceladus's Ocean

Enceladus, the sixth-largest moon of Saturn, has long been regarded as one of the most compelling ocean worlds in the Solar System. Its subsurface ocean is composed of water, and what truly draws scientific attention is the ice plume erupting from fractures near its south pole. These ice grains are not products of surface weathering; rather, they originate from the deep interior ocean and are transported upward through fractures before being expelled directly into space.

During its fifth close fly-by (E5), the Cassini–Huygens mission obtained valuable mass spectral data from these ice grains. The spacecraft passed through the plume at a velocity of 17.7 km/s, causing the grains to undergo high-energy fragmentation upon impact with the Cosmic Dust Analyzer, generating abundant ions for analysis. Because these ice grains spent only minutes traveling from the ocean to the instrument, they can be considered pristine samples of the subsurface ocean, largely unaffected by space weathering. Their chemical composition therefore provides direct insight into the nature of Enceladus’s oceanic environment.

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