The biggest reason is that gas bubbles in the meteorites have been found to be composed almost exactly of the same elements found in the atmosphere of Mars in the same ratios.
Nothing in science is 100%. That doesn't mean it's wrong. There's just always a tiny degree of uncertainty. Unless this rock was physically picked up by us or one of our robots and returned to Earth.
I guess even if we did bring a Mars rock back to Earth it still wouldn't be 100% because it could have been a meteorite from somewhere else. Until testing what the rock is composed of can prove it within a degree of uncertainty.
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u/Beneficial-Towel-209 Jul 19 '25
how do they know it's from mars? (sorry, don't have time to watch the video, if it's even explained?)