NASA researchers are said to be intrigued by an image (seen above) taken by the Mars exploration rover Spirit sometime this year between May and June. The image, in which one can see an unusual semi-circular formation, shows what some believe might be the wreckage of a UFO or possibly some type of UFO engine part, adding weight to the notion that Mars has been visited or is currently being visited by aliens.
A number of experts have suggested, alternatively, that the foundations of yet another alleged ancient Martian structure, demonstrating that civilization once existed on the red planet, are seen in this photo. Others have claimed that the picture simply shows oddly shaped rocks and nothing more.
The notion that Mars was once home to a technological civilisation is not new and dates back to the 1800s. It has been suggested by some UFO researchers that humans might have originated in Mars, having fled the planet after a climactic catastrophe. On arrival to earth these new settlers discarded their spaceships and eventually forgot their origins.