Light Photons

Yes it have weight, for more in detail study refer Modern physics.

another ? guys. is time and the speed of light the same thing? if a person travelling at a high speed and arrives at some point ahead of time, how does that apply to the physical aspect of things? younger for example. or is it just something abstact?

The photon is a massless particle. It has no 'weight' per se -- though, if a photon is absorbed the 'weight' of the object absorbing it will theoretically increase according to E=mc². Its path follows a geodesic through space-time and will 'curve' in the presence of a gravitational field due to the equivalence principle.

Here's a link to an excellent and very entertaining book that will answer most of your questions. Read it, then come back and ask more questions:

http://www.amazon.com/Tompkins-Paperback-containing-Wonderland-ebook/dp/B001PO59EW/ref=sr_1_3?ie=UTF8&qid=1296307252&sr=8-3

I'm reluctant to answer all of your question, because I don't know exactly what some of it is saying / asking (and if I misinterpret it, I may answer it incorrectly), but, if your question is: "is the slowdown of time at speeds close to the speed of light something real or something abstract", the answer is that it is something real.

As one example, look for the experiments on the lifetime of certain particles as they approach the earth at very high speed (I can't remember which particles were the subject of the experiment, and don't have a reference directly to hand), but the gist of the experiment / results was this:

The concentration of particles was measured at some high elevation (6000 meters?) and then at ~sea level. Based on the time that a non-moving observer on earth measured for the transit from the high altitude to the low altitude, the particle concentration at sea level should have been some very low value.

The concentration of particles at sea level was actually much higher than that, and, after suitable scrutiny, it was determined that it was because time moved much slower for those fast moving particles (thus, more survived to get to sea level).

(As, is often the case, my (off the cuff) paraphrasing of scientific experiments / results is not always precise ;-)

Re: As one example, look for the experiments on the lifetime of certain particles as they approach the earth at very high speed (I can't remember which particles were the subject of the experiment, and don't have a reference directly to hand), but the gist of the experiment / results was this:

Ok, the particles were muons, and you can find a discussion in this video lecture:
http://galileoandeinstein.physics.virginia.edu/lectures/srelwhat.html

if light has mass than its speed makes its weight to infinity.

you just blew my mind

...xrays and gamma rays are photons to(pockets of energy). So they have no electrons, protons or neutrons (according to my old teacher...or if I remember correctly).

Here are some links if you want to read up some more:

http://en.wikipedia.org/wiki/Photon

http://www.phys.ncku.edu.tw/mirrors/physicsfaq/ParticleAndNuclear/photon_mass.html

thanks guys. i've pondered on this question for years. i've never run across anyone smart enough too know.

Well, I have shined my torch on my hand and the light did not press it down...that is how I found it out!

Here's an experiment to try if you can get your hands on a >1000 joule photographic flash unit. Put your hand in front of the reflector and fire the gun. You'll feel it punch your hand.