NASA'S Mars Exploration Rover Spirit captured this westward view from atop a low plateau where Sprit spent the closing months of 2007. Several bloggers and other enthusiasts have pointed to a tiny structure (red circle) on the Martian surface as a human figure and thus evidence of life on Mars.

The idea that there may be life on Mars has been around forcenturies, but the theory got a dubious boost from recently released photos ofthe surface of Mars (taken by the NASA robot Spirit) apparently showing ahuman-like figure. Several Internet sites have glommed onto the image andsuggested the figure could be alive.

But what is it? Just a rock, astronomers say.

The reason many people see a figure on the Martian landscapeis the same reason that people see faces in clouds, Rorschach blots, and coffeestains. This phenomenon, called pareidolia, is well knownin psychology


Even though logic and science suggest that the image is of a rock and not an animal, UFO buffs and conspiracy theorists will continue to speculate.

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