Relativity is a truly fascinating and interesting subject that I don't fully understand. I'm currently in the process of studying it and this idea popped up in my head. This is just pure speculation from my side, which I expect to be wrong. I'll now try to explain the foundation for my outrageous idea. Please point any errors and mistakes in my reasoning. What's the speed of light relative too? It is a well known fact that nothing can travel at the speed of light. But in order to know what this means - we must know more about the speed of light. The real paradox here is that the speed of light is the same relative to all observers. So our place and velocity relative to other objects is independent of the speed of light. All observers measure the speed of light as the defined value c in their own frame of reference. Coming from this I reasoned that it is actually possible to travel faster than the speed of light relative to other objects. I'll make an example to illustrate this. Let's say our friend George has only one task, and that task is to stand still. In our frame of reference, he's not moving at all. George is our observant. In addition to George there's a blind horse and there's Usain Bolt, and they're both in the exact same spot as George. When George makes the signal Usain Bolt and the blind horse are going to race. As George makes the signal, Usain Bolt runs east, while the blind horse (being a blind horse and all) runs directly west. They both run at 0.60c, or in other words 60% of the speed of light. Judging by my logic, Usain Bolt and the blind horse should, in relation to each other, actually move faster than the speed of light. As I write this I have a feeling that this is wrong. In Usain Bolt's frame of reference, does the blind horse travel faster than c? That would be impossible, because nothing can travel faster than c. If Usain Bolt turns his head and looks in the direction that the blind horse went, what does he see? I really don't know - please enlighten me. The speed of light in its own frame of reference I read something a while back (I don't remember where) that while we measure the speed of light as c, if we let an actual photon be our observer, the photon itself actually experiences that it travels through the entire span of the universe in an instant. I don't have a source for this but I believe it to be true. Does this mean that faster than light travel is actually possible? Because c is the same for all observers, even as we move faster in a space ship relative to earth, we still measure c to be the same relative to ourselves. So as our speed increases - so does our c compared to the c of an observer standing still in space. And if we keep increasing our speed to impossibly fast, we still measure c to be the same. Until we can travel the span of the universe in almost an instant. Again, the paradox here is that while we don't travel faster than c in our frame of reference, isn't it also so that earth can't move away from us faster than c? Because nothing can? My head is about to explode right now. I stand in awe to our magnificent, incomprehensible universe.