The U.S. probe "Stardust" transmitted to Earth Image of Comet Wild-2, close to where he went. On the surface, the space pilgrim, happened to be in the solar system, scientists were surprised to find two strange grooves. From the mind — the prints of bare human feet. They even named accordingly — the "right foot" and "left foot". The diameter of the comet about 5 kilometers. Each "foot" — somewhere with a kilometer. How can any of these signs, it is not typical of comets — with a flat bottom and vertical sides — scientists can not yet answer. But according to the calculations it turns out that the "giant" who left them, could have a growth of about 9 kilometers.