It's "Io", or "io" lowercase, not "Lo"  It's the most geologically active object in the Solar System, even more so than Earth. The blue stuff you see coming out from the planet are actually massive plumes from volcanoes. It's yellow because of all the sulfur, however the guy who "upscaled" it seems to have cranked up the contrast and made the colors much more vibrant. |
I hate arial font. A lowercase "L" Looks exactly like a capitol "I". It can get confusing sometimes. Thats interesting though, thanks for the clarification!
