Kimmo Huosionmaa When we are thinking about the principle of the time machines, we might think that the shape of the machine is like a donut. The system is actually the particle accelerator, what will accelerate the atoms at the speed near of the speed of light, what is 300 000 km/s (kilometers per second), but the thing is that the real speed of the light in the atmosphere is about 299 700 km/s and the difference with the speed of light in atmosphere and speed of light in empty space is about 90 km/s. When we are thinking the case that the atom would decrease its speed when it faces the gas, that would cause the thing, when it will across the speed of light. And in this case, the barrier layer causes the effect, that the atom would send the blue-light sock wave because it will decrease the speed of light because the slowing the particle would not be without time limit. That causes that the time in the craft would be stopped, and this will allow that the time machine will travel