



How can it be broken? Certainly not with anything physical. As it neared the speed of light, it would simply expand to the size of the universe.
It's theoretically impossible.
I don't know the particulars. I read this in a Hawkins book a long time ago, I think he was quoting Einstein.
I came up with the "light has no mass" argument on my own.
I'm not an astrophysicist.