This crystal ball is quite unusual because it is actually a moon of Jupiter , the crystals are ice-crystals, and the ball is not only dirty and opaque but cracked beyond repair. Nevertheless, speculation is rampant that oceans exist under these tortured ice-plains that could support life. Europa , the smallest of Jupiter's Galilean moons , was photographed last month in natural color by the robot spacecraft Galileo , now in orbit around Jupiter . Europa , nearly the same size as Earth 's Moon , similarly keeps one face toward its home planet. The hemisphere of Europa shown above is the one that always trails.
Specific rights apply .