![]() Imagine two people on either side of a 20ft fence and one guy throws 1 tennis ball per second over the fence. You then stop sending more, he receives the rest of yours and then they stop. ![]() He sends his instant photon when he receives your first, by which time you've already sent several of yours. You sending your first photon and him receiving it are different things. Now if you extend that thought experiment and say that you are traveling much faster, you send the FTL signal on the fist received photon from me, and and when I receive the FTL signal from you I would stop sending the photons, it turns out that you send the signal before I even start sending photons, which means you received photons that I never sent. The problem is that it's not really a speed. Tldr going faster than what is commonly referred to as the speed of light isn't even the problem. It's different, like a piece of candy is different than an idea. It isn't that light is faster, like a rocket is faster than a bicycle. You need space to exist, and time for your heart to beat. So you can see that going "faster than light" doesn't really make any sense. There is no distance between any two things, and no amount if time passes for you to get to point a to point b if you're massless. Even if, from our perspective, it actually took billions of years and crossed the universe. If it had a perspective, which it doesn't, it would be absorbed at the same instant in the same place it was emitted. Other people would see your clock slow down so that to them, it looked like it took you millions of years to reach that galaxy. You would still see light moving at the same speed, but you would see the distance between you and your destination shrink. You could actually get to another galaxy, millions of light years away, in a few minutes if you accelerated enough. The ladder paradox goes into detail about how you could actually fit a too long at rest ladder into a garage if you accelerated it enough to measure distances differently. You'll always experience one second per second, but you'll see other people measuring more or less. It isn't just that it looks like things are shorter or take more or less time, these become your actual reality. What happens as you accelerate is you will measure distances to be shorter, and you will see other people's clocks moving at different rates. No matter how much you accelerate, it's not that you get closer to the speed of light as many people suggest. ![]() And we can only measure light at that speed. We happen to measure light at that speed because it has no mass. What we measure as the speed of light is simply a conversion factor. How can something without time or space have a speed? Light doesn't have a special, super fast speed. You can't actually travel faster than light though. ![]()
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