Enceladus tagged posts

Alien Ocean could Hide Signs of Life from Spacecraft

Searching for life in alien oceans may be more difficult than scientists previously thought, even when we can sample these extraterrestrial waters directly.

A new study focusing on Enceladus, a moon of Saturn that sprays its ocean water into space through cracks in its icy surface, shows that the physics of alien oceans could prevent evidence of deep-sea life from reaching places where we can detect it.

Published today (Thursday, 6 February 2025) in Communications Earth and Environment, the study shows how Enceladus’s ocean forms distinct layers that dramatically slow the movement of material from the ocean floor to the surface.

Chemical traces, microbes, and organic material — telltale signatures of life that scientists look for — could break down or transform as they travel...

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Signs of Life would be Detectable in Single Ice Grain Emitted from Extraterrestrial Moons

cartoon of icy moon with ocean interior covered with thin yellow stripe
The drawing on the left depicts Enceladus and its ice-covered ocean, with cracks near the south pole that are believed to penetrate through the icy crust. The middle panel shows where authors believe life could thrive: at the top of the water, in a proposed thin layer (shown yellow) like on Earth’s oceans. The right panel shows that as gas bubbles rise and pop, bacterial cells could get lofted into space with droplets that then become the ice grains that were detected by Cassini.European Space Agency

Could life be found in frozen sea spray from moons orbiting Saturn or Jupiter? New research finds that life can be detected in a single ice grain containing one bacterial cell or portions of a cell...

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Ice Shell Thickness reveals Water Temperature on Ocean Worlds

Encedalus
The frozen ocean world of Enceladus, a moon of Saturn.

Cornell University astrobiologists have devised a novel way to determine ocean temperatures of distant worlds based on the thickness of their ice shells, effectively conducting oceanography from space.

Available data showing ice thickness variation already allows a prediction for the upper ocean of Enceladus, a moon of Saturn, and a NASA mission’s planned orbital survey of Europa’s ice shell should do the same for the much larger Jovian moon, enhancing the mission’s findings about whether it could support life.

The researchers propose that a process called “ice pumping,” which they’ve observed below Antarctic ice shelves, likely shapes the undersides of Europa’s and Enceladus’ ice shells, but should also operate at Ganymede a...

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Mimas’ surprise: Tiny Moon holds Young Ocean beneath Icy Shell

Mimas' surprise: Tiny moon holds young ocean beneath icy shell
Mimas measurements and ocean models. The amplitude of libration in longitude ϕs and periapsis drift variation Δϖ for different internal structure models with an ocean. The colors represent the thickness of the ice crust hs. The gray areas correspond to the measured libration amplitude and perihelion longitude variation. The dispersion represents sensitivity to the crustal polar and equatorial flattenings (see additional tests in Methods). Credit: Nature (2024). DOI: 10.1038/s41586-023-06975-9

Hidden beneath the heavily cratered surface of Mimas, one of Saturn’s smallest moons lies a secret: a global ocean of liquid water. This astonishing discovery, led by Dr...

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