When we consider something traveling at or near the speed of light, the theory of relativity applies, and the thing moving very fast is experiencing time differently than us. My big question is ... Why shouldn't this apply to light? Because light is traveling at the speed of light, and the same math that illustrates objects experiencing time differently should apply to light. When we view light from something 10 million light years away, we assume the light itself is 10 million years old. If this were not true you could raise some interesting questions. This is an unusual point, and how does time really apply to something without mass. But if you imagine aliens observing our world at the wrong speed, they my see everything but not have a real understanding of what there looking at, and the laws of our physics would appear bizarre. When we observe the electromagnetic spectrum and measure wave lengths, we are doing that from our perspective and time, and we are the aliens.