Figure 6-25 RIVUXG Europa Dark lines crisscross Europa’s smooth, icy surface in this false-color composite of visible and infrared images from Galileo. These are fractures in Europa’s crust that can be as much as 12 mi to 25 mi (20 km to 40 km) wide. Only a few impact craters are visible on Europa, which indicates that this satellite has a very young surface, on which all older craters have been erased.