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Could a small comet have hit the area, at a semi-shallow angle,
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On Mars, anything is possible, but in this case, there are *lots* of these sorts of features. Statistically, it is far more likely that we are seeing some flow of inherent water rather than from a single extra-martian source like a comet.
My opinion. I'm not an astrogeologist, and I don't play one on TV, either.