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I ask because I feel a mission to Europa as something much more interesting than landing on Mars because of its obvious potential astrobiological implications. And I suspect that drilling through Europa's ice is never going to happen just by sending some sort of robotic drilling rig alone and think that's something that can't be done without human direct intervention. Obviously we are still far away, in space and time, from such an achievement. However, I'm just wondering how much more challenging than a Mars mission would be a human mission to Europa? What kind of technical impediments would be there more than those we already have to face for a Mars mission? What are the biggest obstacles? (such as the length of the mission, the radiation hazards, the fuel and energy storage?, etc.)