My site: http://www.astronomyisrael.com
Cactus Patch Observatory / 14" LX200
"The four points of the compass be logic, knowledge, wisdom, and the unknown. Some do bow in that final direction. Others advance upon it. To bow before the one is to lose sight of the three."
Quote:The important point is that C has the dimensions of speed but is not itself the speed of anything in particular. It has the dimensions of speed because it is the fundamental structural element in a more inclusive geometry that relates space to time intrinsically. The speed of light is 1. Euclidean geometry has the very same characteristic parameter but the value is imaginary, "i". In that geometry, it characterizes infinity.-drl
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Quote:Quote:The important point is that C has the dimensions of speed but is not itself the speed of anything in particular. It has the dimensions of speed because it is the fundamental structural element in a more inclusive geometry that relates space to time intrinsically. The speed of light is 1. Euclidean geometry has the very same characteristic parameter but the value is imaginary, "i". In that geometry, it characterizes infinity.-drl I guess in light of this the original question might be re-formulated: Why does anything go slower than the speed of light?
Quote:Recently I had been thinking about the speed of light. I believe the speed of light in a vacuum is c. 186,000 mps (c. 300,000 kps) and that this figure is represented by the symbol "C". Then, in another post, Jarad began a comment with the words, "As a practical matter, if we don't figure out a way around the hard limit of C"...." His comment caused me to get brave and post the question I have had in my mind.Is there anything in physics which can explain why C (in a vacuum) is c. 186,000 mps and not say 1 million mps or 5 mps? Is there something about the nature of the universe, light, stuff in the universe, etc. which might explain this?Otto
TS 130/912 (f 7.10) Triplet Apo Refractor TS 152/1200 (f 7.90) Achromatic Refractor Astrologers say the future is written in the stars but Astronomers know this more so applies to the past... http://www.flickr.com/photos/72473941@N03/
"Scientists aren't perfect, just peer reviewed.""Eye of Sauron Observatory", featuring "Sauron's Other Eye", 16" dob, conical Royce mirror.
"After the Laws of Physics, everything else is opinion" -Neil deGrasse Tyson
Elmira-Corning Astronomical Society
Quote:Why is c~3x10^9 m/s in our universe now and seemingly, for most of its current history? Why can't it be larger or smaller?
Quote:Particles with mass travel slower than the speed of light since the space-time momentum four-vector cannot be a null. That's a way of saying that since space and time are interconnected, and that the energy and momentum are interconnected, then the fact that a rest mass exists, the particle travels through space and time at different rates. Essentially, the world line of the particle is constrained to be time-like.
Quote:Truly, I appreciate all the discussion that is going into this. But, is it possible for one of you to do a "Jarad" or a "Dave" and put these thoughts into even simpler words for me to begin to understand them. Why is c~3x10^9 m/s in our universe now and seemingly, for most of its current history? Why can't it be larger or smaller? Thanks guys (and gals?) Otto
John Hayes, Ph.D.
Adjunct Research Professor
College of Optical Sciences
University of Arizona
Quote:doesn't the Universe have to expand faster than c?
Quote:The material that emitted the light which we are currently receiving as CMB is now at a distance from us of 45 billon LY. The light managed to get here in slightly less than the age of the expansion which is 13.7 billion years. The material was much closer to us when the light started its journey. It didn't break any speed laws. Yet it seems to have come all the way across the balloon surface to us from a point which is now 45 billion LY away. This might strike you as paradoxical but it isn't really. The balloon analogy shows you how light can cover enormous distances in less than the expansion age.
Greg - Celestron SkyScout 90mm refractor & planetarium
Quote:(1) why does "c" remain a constant in any given universe;