One of humanity's conceits is that we tend assume the physical appearance of aliens would roughly conform to the life-forms we have here on Earth. Which is why it is no surprise that extra-terrestrial enthusiasts are abuzz over a new picture NASA has beamed down from Mars that reveals what many are calling an alien skull.

The skull's hockey-mask-shaped face, which has been estimated at about 6 inches across, appears to have eye sockets, a nose and a small mouth. Check out the picture and let us know what you think in the poll.