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Images beamed back from Mars would suggest so - although to sceptics, it could just be a strange rock formation.
Nasa's Mars Explorer Spirit sent back images from the surface of the Red Planet four years ago, and there was initial disappointment among scientists that they lacked any signs of life.
But space and science fiction enthusiasts are convinced there is more than meets the eye, and after years of studying the images, have found what appears to be an alien figure walking downhill.
Originally posted by Essan
Unless I see evidence of it moving I'd say it's just a boring old simulacra - a natural object that to human eyes appears vaguely human (we have an natural tendency to imagine human features where none really exist - see for example those on Fortean Times www.forteantimes.com... )