For example, Io's volcanism was traced in part to interaction of Io with the moons, as well as with massive Jupiter.
Made a distant flyby of Europa, and also yielded insights about how the gravity of one moon in Jupiter's system influences the gravity of others. The spacecraft made a flyby of Europa at nearly 375,000 miles (600,000 km) away, only allowing it to see some variation on the surface. This passed too far away from Europa to get a detailed picture, but the mission did note some variations in albedo (brightness) on the moon's surface. At the poles of the moon, the temperature never rises above minus 370 F (minus 220 C).
Temperature: Europa's surface temperature at the equator never rises above minus 260 degrees Fahrenheit (minus 160 degrees Celsius).
