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John Scott asked the Naked Scientists: An advert on telly about skin protection stating that light can penetrate through thirty meters of water, so what can it do to your skin triggered a thought in me. What happens to the photons of light that penetrate the oceans, in fact what happens to the photons of light that hit the earth? If photons have mass as proven from solar eclipse observations of stars behind the sun, then is the earth increasing in mass from these photons from the sun and is the sun losing mass from expelling the photons? If this is the case the Earth's gravity would be getting greater and the Sun's gravity will be reducing. The Sun's gravity will be reducing anyway as it burns hydrogen, at a guess, millions of tonnes per second.John Scott.What do you think?