This is actually the first conclusion, another theory. Originally thought that all human understanding of the universe, what research on decomposition rate of synthesis is very thorough. But suddenly one day, no matter what the launch on the platform of green light laser, measuring its speed is constant on another platform. And then you’re blind, melancholy, until the last one to help people find a new theory to explain this problem. So the answer is not because certain theory, light can travel faster than light, but so far, the experiment not even a little bit of super speed of light.
“The relative velocity we assume that someone close to green light laser, then according to the theory of relativity, his time” relatively slow to close to us “(stop watch his speed, his aging speed, in our view, slow to almost stop); but in his opinion, his time is normal. That is to say, we are in two different time reference and him.
Observation on the reference system in which we live, because of his green light laser time “relatively slow to close to us” stop – we can assume that the time to slow down N times. So in our view, this light is light from his relative speed c slow N times.
Any of the two in the relative motion of the object, in fact, are in a different frame of reference, time lapse speed is different. Only our usual velocity relative to the green light laser is too small, so each time the different speed can almost be ignored.