"Composed of images taken by the Galileo spacecraft in 1995 and 1998, this reprocessed image of the icy Jovian moon Europa shows cracks, ridges, ""microchaos,"" and more. We now believe that Europa, like several other moons in the solar system, is an ocean world. Due to heat caused by Jupiter's gravitational push-and-pull, there is liquid salt water beneath the ice, water that may contain life."