Jupiter's frozen moon Europa is likely blanketed by fields of 50-foot-tall (15 meters) spikes of jagged ice called penitentes. According to new research, these "sublimation-sculpted blades ... could pose a hazard to a future lander on Europa."

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Jupiter's frozen moon Europa is likely blanketed by fields of 50-foot-tall (15 meters) spikes of jagged ice called penitentes. According to new research, these "sublimation-sculpted blades ... could pose a hazard to a future lander on Europa."