Image taken by NASAs Curiosity rover shows weathered rock that some say resembles a thigh bone on Mars

NASAs rover has photographed a strange formation of rocks that someUFO hunters claim are really fossilized alien bones proving theres life on Mars.

The one-ton Curiosity rover, which has been scouring the surface of the planet since August 2012, sent back a pair of images that resemble thigh bones and a hip bone protruding from the planets surface.

The alien-hunter group Martian Archaeology presented the images in a videoclaiming the photos are evidence of signs of life:

Some took the photos as surefire evidence that NASA must be hiding proof of life.

After years of research and study, Im convinced now, more than ever, that there[s] much more to Mars then [sic] what NASA admits to, wrote T.J. Devereaux in the comments section of the video. Im certain life, including water, and intelligent life forms, once occupied the planet, and big leap here that both still exist, in much smaller quantities.

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However, NASA has said the following 2014 photo which some have claimed could be an alien thigh bone is just another weathered Martian rock.

Image taken by NASAs Curiosity rover shows weathered rocks that some say resemble a thigh bone on Mars

In the photo description, NASA explained that the Mars rock may look like a femur bone, but its not the remains of a dead Martian.

Mission science team members think its shape is likely sculpted by erosion, either wind or water, NASA explained.

Even so, if aliens dolive on Mars, theyre more likely to be microscopic creatures, the scientists said.

If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes, NASA officials wrote in the photo description. Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely.

Some also claimed another photo snapped by the rover resembles a hip bone:

Image taken by NASAs Curiosity rover shows weathered rocks that some say resemble a hip bone on Mars

Alien enthusiasts say a weathered rock found on Mars (right) resembles a hip bone (left) (Photo: YouTube screenshot)

Apparently humans seeing shapes in Mars rocks is nothing new. In the 1800s, astronomers believed they located canals on the Red Planet.

And in 1976, a photo from NASAs Viking 1 orbiter depicted a rock formation thatresembled a shadowy human face, known as the Face on Mars.

Face on Mars

Since then, other photos revealed rock formations resembling a lizard, a rat and even a jelly donut.

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NASA rover spots 'alien thigh bone' on Mars