I got a question. Does light always travel in a straight line? Well, let me think about that. . . . I would have to say no. Doesn't a mirror change the direction of light? Well, yes, but it is reflected in a straight line, too. Maybe I ought to re-phrase that question to, "can light travel in a curve?"
It seems to be common knowledge that nothing can move faster than light. . . or can it? Let me pose another question. Let us assume that I have a very powerful flash light that can shine a spot on the moon that we can see from here. Now, if I move this flash light back and forth as fast as I can, does the beam of light curve or does it stay perfectly straight? OK, you say it stays straight? By flicking my wrist back and forth just as fast as I can so that the spot of light from it on the moon travels back and forth from on side of the moon to the other in just a very small fraction of second. The speed of light is 670,616,629 miles per hour. The moon's width is 2,159.2 miles and the average distance from earth is 238,857 miles (since the moon is in an elliptical orbit, it gets a lot closer and a lot further away than that).
I would have to flick my wrist very, very quickly to see the light beam bend. The spot on the moon would have to move from one side to the other quicker than .0000032 seconds and I am physically not capable of moving my hand anywhere near that fast. So, I don't believe anything ever will move faster than light (which makes time travel impossible), what do you think?