If you're planning a trip to Jupiter's moon Europa, be prepared for a rough landing.
In a study released Monday, scientists say they've found evidence of huge, jagged "ice spikes," some 50 feet tall, on the moon's surface. They spikes would "pose a hazard to any future space mission landing on the moon," according to the study.

https://phys.org/news/2018-10-giant-jagged-ice-spikes-jupiter.html