Dyson Spheres and the Speed of Light

Many years ago when I was living in Switzerland, one of my co-workers and friends there was almost as much of a physics nerd as I would like to think I am, and we were wondering about different ways to shoot things off at the speed of light. As it turns out, you can end up in some pretty impressive energy realms when you start moving things really fast (for instance: Oh-My-God particles that are cosmic rays (subatomic particles) with kinetic energies similar to macroscopic objects like baseballs!)
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