Mars surface has obvious signs, that once upon a time, had oceans and its frozen poles are still visible today. Perhaps it was livable many hundreds of thousands of years ago, perhaps by the same time Earth was an inhospitable hell of molten lava and poisonous gases. Something "unknown" happened, that got rid of that planet atmosphere, or maybe it was always thin, and its seems to have lost its protective magnetic layer as well, in any case everything dried up.

But it seems to me, that at some point in the history of this "Solar" system, it was Mars and not Earth the habitable planet.

Thing is, cosmic history is so vast and wide compared to the minuscule existence of human life. How could we possible ever know? A little has been found by looking real far, deep into space in all directions. After all, what you observe from here, is already far in the past over there... But eventually you reach what they call "big bang" for lack of a better term. And then we cannot see further, doesn't mean there wasn't actually anything before...

We are so insignificant it is a miracle we still exist, but for how long? Many space faring races might have come and gone before they had the chance to interact with any other, due to the sheer distances involved, and time relativity.

To quote a fellow Vulcan: "Fascinating".