First, NASA's Dawn probe spotted curiously sparkly bright spots on the surface of Ceres, the dwarf planet that lies in the asteroid belt between Mars and Jupiter.the scientists said.Now, cameras on the tractor-trailer-size spacecraft have captured a baffling structure rising 3 miles above the planet's cratered surface.Conveniently, the thing looks an awful lot like a pyramid."Intriguing," the NASA scientists said.NASA chief scientists: 'Indications' of alien life by 2025