We loved the simple, yet very elegant design and the combination of realistic outer moons paired with traditional moon phase symbols on the inside. (geekwrapped.com)
This substance may originally have been ejected from the small, dark outer moons of Saturn during impacts with space debris. (newscientist.com)
«Maybe people could control robotic machines from Jupiter's outer moon Callisto, where the radiation is much less powerful, especially on its back side,» Martin suggests. (discovermagazine.com)