My theory of Mars is that billions of years ago a meteor of that size may have actually hit Mars and caused the damage that video showed, causing the planet to be in its current state.
I'm not saying there were life forms as advances as ours, but even if there were, while a meteor of that size could have hit Mars, would it have been able to destroy ALL of the evidence of possible life? If it was just animals, then maybe.
But if a meteor or asteroid that size ever hit Earth and turned the whole planet intp rubble, there would still have to be traces of former life on Earth, either fragments of destroyed buildings, shipwrecks, pieces of metal, something.
On Mars there is just nothing.
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