Enceladus' North Pole Heat Emission Suggests Ancient Subsurface Ocean
Recent findings indicate that Saturn's moon Enceladus emits heat from both poles, suggesting its subsurface ocean has remained liquid for billions of years, enhancing prospects for extraterrestrial life.
Recent analyses of data from NASA's Cassini spacecraft reveal that Saturn's moon Enceladus emits heat from both its north and south poles, indicating a long-standing subsurface ocean. This discovery enhances the moon's potential to support extraterrestrial life.
Previously, significant heat loss was observed only at Enceladus' south pole, where geysers eject water vapor and ice particles into space. However, new measurements show the north polar region is approximately 7°C warmer than expected, suggesting heat is also escaping from beneath the surface there. The detected heat flow at the north pole is about 46 milliwatts per square meter, contributing to a total global heat loss of approximately 54 gigawatts. This figure aligns closely with the estimated internal heat generation of the moon, indicating a thermal balance that could sustain a liquid ocean over geological timescales.
Dr. Georgina Miles of the Southwest Research Institute stated, "Enceladus is a key target in the search for life outside Earth, and understanding the long-term availability of its energy is key to determining whether it can support life." Dr. Carly Howett of the University of Oxford added, "Understanding how much heat Enceladus is losing on a global level is crucial to knowing whether it can support life. It is really exciting that this new result supports Enceladus's long-term sustainability, a crucial component for life to develop."
The study also refined estimates of the ice shell thickness, suggesting it ranges from 20 to 23 kilometers at the north pole and 25 to 28 kilometers elsewhere. These findings provide valuable insights for future missions aiming to explore Enceladus' habitability and search for signs of life beneath its icy crust.