Physics, Astronomy & Cosmology / Re: Why Light folows the space-Time curve?Not the the shorthest Line?« on: 15/01/2013 01:32:08 »
Maybe I didn't make it clear that I was presenting a thought experiment in which a string of zero weight were under tension. Since it has no weight, it will not sag. It will be perfectly straight, locally, just as a light beam is. A light beam always follows a straight line, from its own perspective. I presume one can meaningfully speak about the perspective of a light beams since Einstein depended upon such thought experiments in forming Relativity. In thought experiments, one should ignore every inconvenience of real physics, so long as the logical basis of the argument isn't invalidated.