Why alien moons may be a great place to find extraterrestrial life. - NBCNewsMACH
was a reconnaissance of the moon. In the early 1600s, Johannes Kepler trained a low-grade telescope on that pockmarked rock, and figured that the roundish craters he saw were the domes of subterranean cities, teeming with lunar inhabitants.
Phil Sutton, an astrophysicist at the University of Lincoln in northeast England, recently pointed out thatWhy should anyone think that? As a consequence, such moons are subject to periodic stretching and squeezing. The distortions are small — typically on the order of a few meters — but this never-ending moon massage produces internal warming, just like kneading bread dough causes it to heat up slightly.
So when scientists think about where they might find biology in our own neighborhood, as opposed to other star systems, they're particularly enthused by three moons of Jupiter — Europa, Callisto and Ganymede — and two of Saturn — Enceladus and. Liquids are thought to ebb and flow in, or on, all of these small orbs. And in the more than four billion years since they were whelped, it's hardly unthinkable that some might have spawned life.
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