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How can light waves, that can be stopped by thin tissue paper, travel millions of light years across space?
I am struck by the apparent contradiction that a photon or light wave can have enough energy to travel such vast distances and yet have so little energy that it can be interrupted so easily.
It's not a matter of great energy to travel a large distance. In a vacuum, there is nothing to stop objects. Once in motion, any object will keep going until some for acts on it. A photon(s) of light will travel untill someting absorbs it or reflects it or refracts it. Tissue paper DOES absorb light, depending on the intensity of the light, it will absorb all or a fraction of it. Pretty much anything physical absorbs light, even glass, though the absorption is very small for glass. Of course this is dependent on wavelength, some wavelenths are absorbed more than others and if you go to shorter wavelengths like x-rays, they pass right through the paper. Longer wavelenths like radio waves also pass right through.
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