Europa (IMAGE) University of Washington Caption This satellite image shows red streaks across the surface of Europa, the smallest of Jupiter’s four large moons. The discovery of new types of salty ice could explain the material in these streaks and provide clues on the composition of Europa’s ice-covered ocean. Credit NASA/JPL/Galileo Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.