"We know from NASA Galileo mission data that the surface crust is relatively thin, but we don't know how thin it is. One of the goals of the Europa Clipper mission is to measure the thickness of that ice shell."
"The surface is riddled with fractures that indicate tectonism is actively resurfacing the moon. Its crust is primarily composed of water ice, but there are also exposures of non-ice material along these fractures and ridges that we believe include material coming up from within Europa."
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