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I find it highly likely that these also could have been unmanned. We use drones and robotics all the time know to explore hostile environments. And given the scarcity of life in the universe, these vehicles may not have even been looking for life; but just doing a preliminary survey, and happened to stumble across it.

[QUOTE="Red, post: 246913, member: 2052"] I find it highly likely that these also could have been unmanned. We use drones and robotics all the time know to explore hostile environments. And given the scarcity of life in the universe, these vehicles may not have even been looking for life; but just doing a preliminary survey, and happened to stumble across it. [/QUOTE]

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