Europa's surface is made of water ice and so it reflects 5.5 times the sunlight than our Moon does. Europa orbits Jupiter at about 417,000 miles (671,000 kilometers) from the planet, which itself orbits the Sun at a distance of roughly 500 million miles (780 million kilometers), or 5.2 astronomical units (AU). Europa is primarily made of silicate rock and has a water-ice crust and probably an iron-nickel core. Cracks and streaks striate its surface but it has relatively few craters.