木星的卫星木卫二的海洋被估计位于大约100千米厚的冰层之下,然而最新的科学研究显示,即便如此,被这个海洋溶解的物质仍可以传输到木卫二的表面。天文学家长久以来一直对木卫二的两副面孔感到困惑:它永远面朝木星的前导半球是微黄色的,而它的后随半球则纵横交错着赤色的斑块和条纹。伽利略号探测器曾于1995年至2003年环绕木卫二飞行,但是伽利略号上的传感器以相对宽泛的波长带对木卫 Jupiter’s moon Europa’s ocean is estimated to be located under about 100 km of ice, but recent scientific studies show that even the matter dissolved by the ocean can be transported to Europa’s surface. Astronomers have long been puzzled by the two faces of Europa as long as the leading hemisphere that faces Jupiter forever is yellowish, while its trailing hemispheres are crisscrossed with red patches and stripes. The Galileo probe circled Europa around 1995-2003, but the sensors on the Galileo mounted a relatively broad wavelength band to Europa