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Energy seems to be something that is appropriated by things. However, depending on the frame of reference, this energy seems to be able to vary. But we know that energy is a property of matter. That is, matter can contain more or less energy. In other words, matter can be possessed by more or less energy. But photons of light carry energy. The question is: How can light have energy but no mass? A very strange concept that deserves to be mapped out carefully. Content 00:00 - Introduction 00:54 - Energy 01:54 - Mass 02:47 - Reference frame 05:01 - Momentum 07:53 - Relativistic energy 09:09 - Light 10:29 - What is a constant 11:34 - Reference frame for velocities 14:05 - Waves 16:39 - Experiments 21:31 - Relativity Main reference Quantum physics: Eisberg and Resnick Complementary reference https://www.wtamu.edu/~cbaird/sq/tag/... Social network / prsjoao.reis Financial support - Pix key [email protected] Be a member of this channel / @cienciamapeada Credits Research: Me Script: Me Narration: Me Audio editing: Me Image editing: Me Illustrations: Me Video editing: Me de Novo