help me lrn2physics

Hey /sci/,

How the hell can something be massless? Someone told me that light is a massless energy particle or some shit like that but that can't be possible because in order for something to actually exist, it must be made of something, and that something has to have mass, regardless of how minute it is right? Or is this correct since light is suppose to have duality? Please edumacate me.

>>18
Are you absolutely sure that statement is true? You see, if photons or light can't breach a speed barrier it means that in fact it does have mass because it is meeting some form of resistance. Even in a perfect vacuum, what might that resistance be...I wonder?