“They look very Earth-like, but they’re on Mars, so how could they form there?”
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TLDR: “All in all, the scientists argue that a combination of melting ice, sublimating carbon dioxide and high obliquity can help explain the pattern of gullies seen on Mars.”
Yep … mainly because:
The problem with the possibility of gullies on Mars is that these ravines mostly exist at heights where liquid water is not expected under the current Martian climate.