Europa appears pearl-colored in this image from Voyager 1.

Europa From NASA’s Voyager 1

This view of Europa was taken by NASA's Voyager 1 spacecraft from a range of 1.6 million miles (2,869,252 kilometers) on March 2, 1979. The color composite is made from three black and white images taken through the orange, green and violet filters. Irregular dark and bright patches on the surface are different from the patterns on the other satellites of Jupiter and those on the Moon, Mars and Mercury. Dark intersecting lines may be faults that break the crust.

Credits: NASA/JPL-Caltech