One possible hypothesis of civilization on Mars is that it existed in the ancient past, when the planet had a thicker atmosphere and liquid water on its surface. According to this hypothesis, the Martian civilization developed advanced technology and culture, but eventually faced a cataclysmic event that wiped out most of its population and infrastructure. The remaining survivors either went underground, left the planet, or became extinct over time. The evidence for this hypothesis could include the presence of artificial structures, such as pyramids, canals, or statues, on the Martian surface or subsurface, as well as traces of biological or chemical activity that indicate past or present life forms. However, this hypothesis faces many challenges and criticisms, such as the lack of conclusive proof, the difficulty of explaining how such a civilization could arise and evolve in a harsh environment, and the possibility of alternative natural explanations for the observed phenomena. Therefore, this hypothesis remains highly speculative and controversial among scientists and the public.
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