View Single Post
Dec2-03, 11:03 PM
P: 837
Originally posted by Unkaspam
Therefore it would seem correct to say that we cannot observe events that are faster than light and will never be able to until we find another method of observation and verification than optical methods.
Why? There isn't any law that says that we have to probe an object's speed with something that travels faster than that object.

Once again, in the spirit of this thread, I'll ask; is it the effect of gravity (caused by the presence of a mass) that travels outward or is it gravity that travels at whatever speed it travels?
Once again, in order for me to answer that question, you need to precisely define what you mean by "the effect of gravity", as opposed to simply "gravity". To be physically meaningful, you have to define it operationally, in terms of an experiment: describe how to carry out two experiments, one of which measures "the speed of gravity" and one which measures "the speed of the effect of gravity". Then I can tell you what our theories of gravity say the outcomes of those experiments will be.