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Are You Thinking of Subsurface Life on Mars?
Are we really ruling out the fact that there may be deep in water deposits below the surface today? I don't think we can rule it out. But right now we don't have any evidence for liquid water on Mars. It's a theory. Whereas on Europa we have strong evidence for a global liquid water ocean That contains two to three times the volume of all the liquid water on Earth. And that's if we've learned anything from life on Earth, it's that where you find the liquid water, you find life.