US EditionHow Does Ice Shell Geometry Shape Ocean Dynamics On Icy Moons? - Astrobiology
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Twenty years of Cassini data are coming back to life – and with it a surprising discovery. A European team of scientists has reprocessed the data and discovered complex organic molecules. These substances come from geysers on Saturn's moon Enceladus, which shoot material from its interior into space....
How Does Ice Shell Geometry Shape Ocean Dynamics On Icy Moons? - Astrobiology
A poleward-thinning ice shell can drive circulation in the subsurface oceans of icy moons by imposing a meridional temperature gradient–colder at the equator than the pole–through the freezing point suppression due to pressure. This temperature gradient sets a buoyancy gradient, whose sign depends on the thermal expansion coefficient determined by ocean salinity. Together with vertical […] The post How Does Ice Shell Geometry Shape Ocean Dynamic…
A Guide to Potential Extraterrestrial Life Biology
The search for extraterrestrial life, a field of study known as astrobiology, is hampered by a fundamental, philosophical problem: we don't have a universal definition of "life." Every living thing we have ever studied—from a bacterium to a blue whale—is part of a single, related dataset. All known life on Earth shares a common ancestor, a common chemistry, and a common evolutionary history. This "sample size of one" makes it incredibly difficul…
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