“I learned about the propulsion system the discs use. They have a particle emitter that first shoots out a particle going three-quarters the speed of light. Then a trillionth of a second later, it shoots out another particle at light speed. The faster particle bounces off the slower particle like a billiard ball and shoots back to the ship, striking it on the side of the disc. This happens trillions of times per second, and each time the light-speed particles hit the ship, they create thrust. When you get trillions of those particle hits per second, it allows the ship to quickly accelerate to near light speed. The emitter can shoot particles from any part of the disc’s round edge, so it is a great design because it can very easily make turns and travel in any direction.”