Quote:
Originally Posted by leonk19
Makes you think that even if Mars didn't have "intelligent" life akin to humans, maybe some form of animal or animals did thrive there billions of years ago, and environmental effects simply wiped traces of them beyond the point where we would ever know.
Who knows, a billion years from now some advanced civilization could happen to come across the Earth and it will look just like Mars, with no visual evidence of what inhabited the planet time ago.
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We wouldn't really know unless we had an incredibly indepth archaeological expedition which yields buried fossils and artifacts from long dead civilizations.