what is the atmosphere of europa made of
Europa (moon) Slightly smaller than Earth's Moon, Europa is primarily made of silicate rock and has a water-ice crust[11] and probably an iron–nickel core. It has a tenuous atmosphere composed primarily of oxygen. Its surface is striated by cracks and streaks, whereas craters are relatively rare. In addition to Earth-bound telescope observations, Europa has been examined by a succession of space probe flybys, the first occurring in the early 1970s.