月球壁纸
by mage data: NASA/JPL-Caltech/SwRI/MSSS Image processing: Andrea Luck CC BY
NASA Image Library · 公有领域（Public Domain）
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NASA's Juno spacecraft made a distant encounter with Jupiter's moon Europa on its 37th close pass by Jupiter. This image from the spacecraft's JunoCam was taken at a distance of about 51,000 miles (82,000 kilometers). Color and reflectance variations across Europa's regions can be seen in this JunoCam image. Although the resolution of the images is just 50 to 60 km per pixel, the data fills in a previously un-imaged area around the north pole near the center of the image. As Juno's orbit evolves, it is crossing the orbits of the Galilean moons. The next encounter with Europa will take place i…
