I was recently talking about the concept of mass and, in short, at the entrance I came to the conclusion that the mass is nothing more than a manifestation of the different types of energy that make up an object. […] But, after reading the entry, some readers have a doubt: if, on the one hand, the mass is a reflection of the amount of energy contained in an object and, on the other, the light has energy … So, why does light have no mass?

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