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 Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...The Space and Astronomy Agora Re: Time, Photons And Interactions. Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response ToPosted by daViper on July 14, 1999 02:20:47 UTC

: : : photons have zero mass at rest

: : ::(daViper) : : Hmmm. That forces me to ask two questions myself.

: : If you are implying that photons do not have zero mass when in motion, where does the mass come from as a result of this motion?

: : If the universe is expanding, can anything, including a photon, ever be said to be "at rest"?

: : Actually, what I was wondering about doesn't really have anything to do with the mass of a photon. Because when an object approaches the speed of light, time slows down for it (relatively), and when 'c' is reached, time would stop, mass becomes infinite etc. So, since light travels at 'c' does this mean time has stopped for it? It is said that ligth has zero rest mass, how can it have mass when it is moving. The mass of a moving photon is probably just it's energy equivalent(e=mc2). Is there anyone out there who can answer or clarify this? Where's that nate person, he/she seems to know alot about this stuff.

:::: Forgive me if I came across as a little obtuse, but your question sparked those quick thoughts i had and had to write them down.

As you say, the mass can "probably" be calculated as it's energy equivalent but I don't know for sure.

I DO know you are speaking of the time dilation effect and how Einstein wrestled with this himself at the theoretical level since it has implications that remain unresolved to this day, regarding the infinite mass/energy/time problem.

I hear a lot of speculation on this but no real concrete theories that can be tested at this time however. Personally, I think it's still a Language Removed shoot since there are areas where Relativity and Quantum Theory do not reconcile with each other such as in the case of the Double Slit experiment and the resultant EPR Paradox when polarization is applied.

I'll keep watching to see if you get a good answer.