Special relativity requires time to slow down for matter objects as they move faster to keep the speed of light constant. Einstein didn’t explain why, but in this model it is because moving faster increases the quantum network load, so life events occur slower, just as a game slows down when the computer is busy with a big battle (2.3.1). Likewise, our game of life slows down under load.
His example of a twin leaving on a rocket who returns after years of high-speed space travel to find his twin brother on earth is an old man then could happen. Experiments confirm that a muon traveling at 99.5% of the speed of light which should travel 300 meters in its millionth of a second life, actually travels 3,000m, so speed extended its life tenfold. Relativity lets a rocket accelerating at one g go to our nearest galaxy and back in 60 years, but it would return to an earth that is four million years older (Harrison, 1986, p157). For the rocket crew, time would pass as usual, but they are actually in slow motion, as thousands of years pass on earth for each of their years.
Relativity implies that time stops at the speed of light, so a matter clock sitting on a photon wouldn’t tick at all. Light from the Andromeda galaxy takes 2.5 million of our years to arrive on earth but according to relativity, no time at all passes for the light itself. It also starts and ends its journey at the same location by length contraction! Needless to say, this makes no sense, as how can light move at all if its time stops? It can’t, so matter time doesn’t apply to light.
Time passes for matter when it doesn’t move, which allows life events to occur, but light never stops, so its time doesn’t pass that way. A standing wave that always moves is no longer a standing wave, so matter can’t move as light does. Light is then the ultimate messenger because as a wave, it can always move at the speed limit of our universe.