Quote:
Originally Posted by photon
It might help to remember that while light has no mass, it does have energy (and energy and mass are interchangeable).
I think this used to be referred to light not having a rest mass but having a relativistic mass, but I don't think they use that anymore.
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That does help I agree, I am just trying to understand how gravity exerts force on a body without mass, and even momentum of an object without mass. I read a bit on Planck's constant and quanta.... it is sinking in a little. I need to read more, the brain is getting mushy.