If you could lick Jupiter's moon Europa, it would taste like earthly seawater. A fresh look at the moon's icy surface has revealed magnesium salts – the best evidence yet that material can seep from Europa's buried ocean to its frozen surface, providing a glimpse of the moon's liquid innards.
"We think the ice shell of Europa is serving as a window into the ocean below," says Kevin Hand of NASA's Jet Propulsion Laboratory in Pasadena, California. "Europa likely has a sea salt composition similar to our own ocean."
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