Einstein's thoery of E=MC2 pretty much means that if you somehow got to the speed of light then your mass would become infinite and you would become light or energy. Besides, how the heck you are supposed to see where you're going if you are moving at the same speed as light?

I've seen a UFO... that is, I saw something one evening that was flying at such incredible speeds that it couldn't be explained. Jets in the sky looked like they were crawling in comparison. And I've seen plenty of meteors in my day as well as satellites, the ISS and space shuttle flying in tandem, etc. and it wasn't any of those. Space is just too big to traverse so I'm more inclined to find another answer instead of "visitors from another planet"... that's just a cop-out. And the fact that our own government and many others seem so unconcerned - if there were aliens flying around we'd be doing a lot more than just trying to cover it up. Once you stop thinking about aliens, UFO's get a lot more curious.