Because time slows down at the speed of light does then light itself potentially travel at almost infinity per zero seconds? (trying to leave aside relativity and gravity issues for a moment, so just theoretically?) Is that then the real reason why nothing can go faster than light - ie. light is actually at infinite speeds only limited by the medium it travels in, our universe time/space in this case is limiting the speed in a less obvious but similar way that dense glass might change light speed and wavelength. It's not that light speed is the limit but that light itself is the only thing fast enough to fully reach whatever that limiting factor is? I know it's a daft question as we are stuck in this universe and I realise it's getting back into an ether theory, but just hypothetically, as I then have some other questions?