Briley Lewis (she/her) is a freelance science writer and Ph.D. Candidate/NSF Fellow at the University of California, Los Angeles studying Astronomy & Astrophysics. Follow her on Twitter @briles_34 or visit her website www.briley-lewis.com.
NASA’s Juno spacecraft has been exploring Jupiter since it arrived at the planet in 2016. In recent years, the mission has turned its attention to the gas giant’s many moons, including the hellish volcanic world Io and the ice ball Europa. Now, in research published in Nature Astronomy, the Juno team revealed new photos of Jupiter’s largest moon, Ganymede, which show evidence of salts and organic compounds.
Importantly, material on the surface of Ganymede might tell us about the water hiding below. If there are salts above, the subsurface ocean might have that same brine. Oceans, including the ones on Earth, acquire their salt from chemical interactions where liquid water touches a rocky mantle. This kind of exchange is “one of the conditions necessary for habitability,” says lead author Federico Tosi, research scientist at the National Institute for Astrophysics in Rome, Italy.
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