As far as I know photons don't have mass but they do have momentum ($p=mv$). Scientists say that if we put a shiny (reflective) shield of large radius in the vacuum of space, then light from sun will will start moving the shield. How can these two facts be commensurate?
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okay got it! it doesnt have nothing to do with momentum the electric charges that forms light make it sail.. – Arun Malik Feb 19 '14 at 15:46
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3It does have everything to do with momentum. Light does not have charge or mass, but it does have momentum. http://en.wikipedia.org/wiki/Photon#Physical_properties – hpekristiansen Feb 19 '14 at 15:56
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1It comes down to them having momentum, which brings us to http://physics.stackexchange.com/q/2229/ – dmckee --- ex-moderator kitten Feb 19 '14 at 16:01