Math and Arithmetic
Albert Einstein

What is the mass of light and why?

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November 16, 2009 12:47PM

Light has mass, because it exerts pressure on a body, e.g. solar sails. light must have mass to exert pressure, because the velocity of what causes pressure? matter. and matter definitely has mass! also, light is attracted to black holes by gravity, so it must have a mass, and the wave/particle duality confirms this