<< i believe xeon gas was accelerated past the speed of light in a chamber at -423 degrees >>
Actually you are incorrect. Firstly, Xenon is a sythetically extracted element that is present on Earth naturally to an extent of about 0.0000086 percent. Secondly, the element xenon is used in lamps that produce intense, extremely short flashes of light, such as stroboscopes and lights for high-speed photography. Basically, at a vacuum chamber at -423 degrees celsius, what emitts from Xenon Gas would most definately be light. What you might have heard of is the technique to use a frictionless abnormal temperature environment(manmade) to make xenon gas emitted light travel faster than what was recorded (299,792.458km/s). Mind you that in reality, the speed of light depends on the material that light moves through. Thus, for example, light moves slower in glass than in air, and in both cases the speed is less than in a vacuum. However, the density of matter between the stars is sufficiently low that the actual speed of light through most of interstellar space is essentially the speed it would have through a vacuum, so we don't make much error by ignoring the difference. It is quite possible to find light travelling faster than that of been recorded. One thing for sure, there has been nothing faster than the Speed of Light itself. Einstein is still correct.