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Claire: Will I get travelling expenses? neomycin and polymyxin b sulfates and dexamethasone ointment The researchers say it is unlikely that these phyllosilicates on the surface came from Europa's interior; the moon's thick outer shell, up to 60 miles (100 kilometers) thick in some areas, would present a formidable obstacle. Instead, this broken ring may represent the splash-back of ejected materials scattered over Europa when a space rock hit the moon's surface from a shallow angle, the scientists say.