Joe90 wrote:
What if there has been an advanced society on Mars millions of years ago but it was all wiped out in a nuclear conflict war?
Depending on the types of nuclear weapons used, there would be decay products that would not have been there without a nuclear war. There would also be residual radiation above an expected background level. Neither of these have been detected. There would also be artifacts of a Level 6 civilization; again, nothing of the kind has been detected.
Joe90 wrote:
You never know.
Actually, we would; because while absence of evidence is not necessarily evidence of absence, the application of Occam's Razor leaves only the simplest answer -- Mars has never hosted a Level 6+ civilization.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.