Sending a robotic rover to explore the surface of an alien planet comes with the expectation of finding new and odd objects on the planet. For those monitoring the findings of the Mars Curiosity Rover, which has been investigating the climate and geology of Mars since it landed on the Red Planet's Gale Crater in August 2012, these odd objects have come in what looked like dinosaur spines, mysterious lights, an iguana and dinosaurs in images taken by the rover.

Last week, the Curiosity rover has yet again captured another image that fuels speculations of Mars being inhabited by complex life forms. The image captured by the Curiosity rover on Aug. 14 has been drawing attention because it shows what look like a bone.

The odd structure, which can be easily spotted on the image amidst other debris, resembles a thigh bone causing UFO enthusiasts to speculate that complex life forms may have possibly existed on the Red Planet at one point in its history. The website UFO Blogger, which has been keeping an eye on similar findings by the Curiosity Rover, even described the object as "fossilized thigh bone on Mars."

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