Scientists have published a study that demonstrates the prolonged stability of the underground ocean of Encélado, the icy moon of Saturno. The research, released on November 30, 2025, points out that tidal forces generate enough heat to maintain liquid water under the ice crust for periods reaching billions of years. Essa condition increases the moon’s habitability potential.
The results are based on advanced computational models and data collected by the Cassini mission, completed in 2017. The analysis considers gravitational interactions between Encélado and Saturno as the main source of internal energy.
- Confirmed presence of liquid water rich in salts and organic compounds
- Activity of plumes that eject material from the ocean into space
- Internal temperature maintained above freezing despite distance from Sol
Origin of internal heat
Tidal forces exerted by Saturno periodically deform the interior of Encélado. Esse process, known as tidal heating, transforms gravitational energy into heat.
Previous models estimated limited duration for the liquid ocean. However, more recent simulations show that thermal equilibrium can be maintained over long geological timescales.
Mission data Cassini
The Cassini probe detected plumes of steam and ice particles erupting from fractures in the moon’s south pole in 2005. Later Análises identified silicates, methane and complex organic molecules in these ejections.
The mission’s instruments measured variations in Encélado’s gravity. The results confirmed the existence of a global ocean beneath about 30 to 40 kilometers of ice.
New computational models
Researchers have developed three-dimensional simulations that include viscous dissipation and convection effects in the rocky mantle. Calculations indicate that tidal heating remains efficient even with orbital variations.
The estimated thermal power varies between 20 and 30 gigawatts. Esse value far exceeds what is necessary to prevent the underground ocean from completely freezing.
Favorable chemical composition
The ocean of Encélado contains carbon, hydrogen, nitrogen, oxygen, and chemical energy sources. Essas conditions meet the basic requirements for metabolic processes similar to those found in hydrothermal sources, but temporal stability represents the most relevant factor highlighted by the study.
Implications for astrobiology
The persistence of the liquid environment for millions or billions of years provides a sufficient temporal window for the emergence of simple life forms. Encélado becomes one of the main targets for future missions to search for extraterrestrial life.
Space agencies are already studying proposals for new probes. Projetos include orbiters and even penetrators capable of reaching the ocean through the icy crust.
Next steps in exploration
Nasa evaluates specific mission concepts for Encélado within the New Frontiers program. Agência Espacial Europeia also keeps the moon on its priority list for the 2030s.
The plumes remain active and accessible. Amostras collected directly in space can provide definitive evidence about the presence of biomarkers without the need for drilling.
The study reinforces the importance of icy ocean worlds in the solar system. Além from Encélado, moons like Europa (from Júpiter) and Titã (also from
