Title:[0748] Close-up of Europa Caption:A Voyager 2 image of Europa from a distance of 150,000 miles. Cracks in the icy crust extend for thousands of miles in every direction. Their width ranges from several to 70 km. Copyright: Credit:National Optical Astronomy Observatories

Title:[0322] Close-up of Europa Caption:A detailed view of the cracked icy crust of Europa taken by Voyager on 9 July 1979 during its close encounter. Copyright: Credit:NASA

Title:[0747] Europa from 1.2 million miles Caption:Europa imaged by Voyager 1 from a distance of 1.2 million miles is seen as a bright disk because its icy surface reflects sunlight strongly. Copyright: Credit:National Optical Astronomy Observatories

Title:[4013] Fractured Europa's Icy Crust Caption:This image was taken June 27, 1966, by Galileo spacecraft. The image covers part of the equatorial zone of Europa and was taken from distance of 156,000 km (about 96,000 miles). North to the right and the Sun is nearly directly overhead. The area shown is about 360 x 770 km (220x475 miles). The smallest visible feature is about 1.6 km (1 mile) across. Copyright: Credit:NASA-JPL

Title:[4012] Ridges and Fractures on Europa Caption:This high resolution image of the icy crust of Europa reveals a surface criss-crossed by multiple sets of ridges and fractures. The area covered by this image is approximately 9 miles (15 kilometers) by 7 miles (12 kilometers), located near 15 North, 273 West. North is to the top, and the sun is illuminating the terrain from the right. The large ridge in the lower right corner of the image is approximately 1.5 miles (2.5 kilometers) across, and is one of the youngest features in this image, as it cuts across many of the other features. This image was taken by the Galileo spacecraft on February 20, 1997 from a distance of 1240 miles (2000 kilometers). Copyright: Credit:NASA-JPL

Title:[4014] Europa Ice Rafts Caption:This high resolution image shows the ice-rich crust of Europa. Seen here are crustal plates ranging up to 13 kilometers (8 miles) across, which have been broken apart and "rafted" into new positions. The size and geometry of these features suggest that motion was enabled by ice-crusted water or soft ice close to the surface at the time of disruption. The area shown is about 34 kilometers by 42 kilometers (21 miles by 26 miles), centered at 9.4 degrees north latitude, 274 degrees west longitude. This picture was taken by Galileo spacecraft on February 20, 1997, from a distance of 5,340 kilometers (3,320 miles) during the spacecraft's close flyby of Europa. Copyright: Credit:NASA-JPL

Title:[4015] Close-up of Europa's Surface and similar scales on Earth Caption:This is close-up of Europa's surface that compare images of various areas on Jupiter's moon Europa (top frame) to the same location on Earth, the San Francisco Bay area of California (bottom frame). Both images show areas of equal size, 13 by 18 kilometers (8 by 11 miles), and resolution, 26 meters (28 yards). North is to the top of the picture. Copyright: Credit:NASA-JPL