Life On Mars
Have you ever considered that life on Mars has already been done? With the latest photos of the tubes that come from under Mars' surface and the well known "face" pictures aswell, it makes one really wonder who, how, and when. Is it possible that we (humans) have already left our imprint on Mars, being that of those visible objects on the surface of Mars. If you think about "The Big Bang Theory" about the extinction of dinosaurs and the effects on a planet that it happens.
A giant metor slams into the side of Mars causing an immense dust/dirt cloud over the entire planet of Mars. The cloud stays in the atmosphere for years causing everything living to die off from lack of sunlight, oxygen. Then eventually the cloud settles covering everything with the planets red dirt. Explaining why there is no visible water on Mars. Aswell the recent photos of giant landmarks on Mars are coming to surface from the millions of years of high winds on the open plains. Qute possibly during the event (Big Bang) a few hundred possibly thousands converged together to form an underground city.
They most likely had the knowledge to create oxygen from surface air. Maybe those tubes are massive air vents and intakes from the city underground. Also what im getting at is how on the Earth they have found meteorites with micro-organisms in them, the foundational building blocks of life. During the collison of a meteor and Mars, piecies of Mars which happened to contain these organisms made their way to Earth after the massive impact on Mars. After countless years in space one piece finally reaches earth and starts life on earth. Another possibility is that a giant piece of Mars collided with Earth causing another "Big Bang" killing off the dinosaurs and beginning the life of human.
So with that being said, we continue to look on Mars for life. In some sort of unverisal cycle the atomsphere will soon be back to what it was millions of years ago, with the perfect conditions for living again on Mars.
Sources: My brainwaves