NASA images show a strange black rock on the surface of Maras, with some claiming it is a fossil and that it is evidence of life elsewhere in cosmos. Alien hunters also claim that it is proof that NASA is trying to “drip feed” the public information at a steady pace as to not cause alarm. Prominent UFO hunter Scott C Waring says that there is “no doubt” the object is a genuine fossil and questioned NASA’s motives for not releasing the information.

Mr Waring wrote on his blog UFO Sightings Daily: “While looking at the front page of the Mars Science Laboratory website, I noticed that they placed a photo with a huge black fossil right on the freaking front page!

“How could anyone who has any experience at ancient fossils and artefacts have even possibly have missed that?

“NASA really doesn't care about finding life, or proving that life once existed on other planets.

“They only want to drip feed the public boring science facts to satisfy the publics curiosity. Its called the trickle down theory and NASA perfected it.

“There is no doubt in my mind that this is a ancient fossil.”

However, sceptics and NASA would say the fossil and other similar findings are just the effects of pareidolia – a psychological phenomenon when the brain tricks the eyes into seeing familiar objects or shapes in patterns or textures such as a rock surface.

This would mean that the Martian 'fossil' could just be a misshapen rock.

This is not the first time that ‘evidence’ of aliens on Mars has been discovered.

Earlier this year, an "alien face" was found in a NASA satellite image of Mars, according to more bonkers claims.

Mr Waring was convinced it could be a rock carving, done by a Martian race, in the same way ancient Britons carved out the chalk figures in hillsides like the giant of Cerene Abbas in Dorset and the Long Man of Wilmington in East Sussex.

However, NASA insisted the rock is just a meteorite impact crater that has been left in the unusual form by later erosion.

When NASA released the image under the "alien head" caption, it said: "The image shows an impact crater in Chryse Planitia, not too far from the Viking 1 lander site, that to seems to resemble a bug-eyed head.

"The two odd depressions at the north end of the crater (the ‘eyes’) may have formed by wind or water erosion.

"This region has been modified by both processes, with water action occurring in the distant past via floods that poured across western Chryse Planitia from Maja Valles, and wind action common occurrence in more recent history.”