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Light possess an electromagnetic field but no mass and it curves spacetime, it means electromagnetic field = gravity... A lightwave travelling through a prism for example, is slowed down by the curvature of spacetime in its path caused by the nearby particles gravitational field. Light always takes the shortest path...

The only explanation for E=MC2 is that matter is entirely related to light.

I really don't understand how it's the only explanation for this. Looking at the equation, I just see that mass is proportional to energy.

Quote from: JP on 11/10/2010 08:12:34I really don't understand how it's the only explanation for this. Looking at the equation, I just see that mass is proportional to energy.Thank you JP, it is a very insightful comment. At first glance, what you says look right but "C" is not a dimensionless constant, it is truly the speed of light...