There is also a well established conspiracy theory that this alleged alien civilisation was wiped out by a nuclear war that destroyed the atmosphere of the planet.
But, space experts have spent decades studying the surface of the Red Planet, but there has so far been no firm proof of any life ever evolving there, let alone intelligent forms like humans.
And, NASA, and other experts deny finding any evidence of even the most simplistic lifeforms yet on Mars, despite sending various rovers and space probes to explore the Martian surface.
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Was there an ancient civilisation on Mars that was wiped out by an asteroid?
Scientists believe that flowing liquid water is almost certainly responsible for mysterious features on Mars. We look back at the most iconic pictures spanning over 40 Years Since NASA Viking I Mars Probe was launched.
Viking 1 was launched by a Titan/Centaur rocket from Complex 41 at Cape canaveral Air Force Station at 5.22pm EDT to begin a half-billion mile, eleven moth journey through space to explore Mars.
New research says mega tsunamis caused by an asteroid strike would have engulfed the planet with water in an extinction level event.
A team of scientists has found what they think is evidence of a tsunami impact crater which could be a game changer in the history of Mars.
Nasa has already said it has found evidence Mars was once covered with oceans much like Earth.
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Last year alien hunters claimed to find evidence of ancient cities on Mars.
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We found typical tsunami deposits along the dichotomy between the northern hemisphere and southern hemisphere of Mars.
Geophysics professor Francois Costard said: “We found typical tsunami deposits along the dichotomy between the northern hemisphere and southern hemisphere of Mars.
“It supports that there was, at that time, a northern ocean.”
The main theoretical reason for the tsunami occurring would have been an asteroid hitting the planet.
Take a look through some peculiar things seen on Mars
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When a large asteroid hits water, it can create two tsunamis when it hits the ocean surface and the ocean floor.
Professor Costard, study lead, added: “The possibility that a large ocean once occupied the Martian northern plains is one of the most important and controversial hypotheses to have originated for the exploration of Mars.”
Although the team did not comment on whether any lifeforms may have existed at the time.
Last year NASA revealed that Mars had lost nearly all of its atmosphere, making it inhospitable now, after the sun stripped it away with solar rays over billions of years.
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