Strange ‘spider’ on Europa hints at water lurking below

View larger. | NASA’s Galileo spacecraft captured this view of the ‘spider’ on Europa – one of Jupiter’s moons – in Manannán crater in May 1998. Image via NASA/JPL/ University of Arizona/ Planetary Science Institute.

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• A huge spider-like formation on Jupiter’s moon Europa appears in a shallow crater. How did it form?
• Briny (salty) water coming to the surface after the impact that...