Map of non-water-ice material on Europa

Map of non-water-ice material on Europa
Map of non-water-ice material on Europa This map of the non-water ice stuff on Europa was taken by measuring spectral ratios across the disk. Where the ratio is low (the red and black regions), there is mainly non-water ice material. Where the ratio is high (white, yellow), there is mostly water ice. In the blueish regions there is a mixture. The image also shows the limit of spatial resolution at the Keck telescope. From the Voyager image on top pick out the crater just south of the equator at about 270 degrees longitude. Now find that spot in the Keck image. You can see it. But just barely. Am I looking forward to the next generation of bigger telescopes on the ground that will have ~3 times better spatial resolution and be able to isolate features such as that crater? Why yes, I am. Voyager map: NASA / JPL / Steve Albers / Bjorn Jonsson; Graph: Mike Brown