Photoshop CS6 tutorial showing how to make a colorful nebula and celestial sphere in deep space. PSD file: <a href="http://goo.gl/NVVMVm">http://goo.gl/NVVMVm</a ...

One physicist tapped into centuries of research on the three body problem of celestial mechanics to probe the potential of these structures. A ring or sphere could, apparently, be stable if ...