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 Mar 19 awarded Good Question Feb 23 accepted Where does the energy lost due to light emission come from? Feb 22 comment Where does the energy lost due to light emission come from? If we have two atoms of the same element, but one of them has an electron in a higher orbit, would the gravitational field of each atom be exactly the same? or would one of them be stronger? Feb 20 awarded Critic Feb 20 comment Where does the energy lost due to light emission come from? Is that what happens when electrons jump into a lower orbit? They emit a photon as a consequence of that leap? Feb 18 comment Where does the energy lost due to light emission come from? Ok, so basically, there's more than one concept of mass. And the kind of mass you measure in a weighing machine is not affected at all when an object emits light. Is that it? Feb 18 comment Where does the energy lost due to light emission come from? You lost me on that last statement. You say that a full battery is slightly heavier but that its "rest mass" doesn't change? In what way the full battery is heavier then? Feb 18 comment Where does the energy lost due to light emission come from? I see. I remember long time ago I heard somebody explaining Einstein's E=m*c^2 as an actual mass loss when an object emits light. Feb 18 comment Where does the energy lost due to light emission come from? @ACuriousMind, you are kind of answering the question but in form of comments. It would be better if you did it as an actual answer. Feb 18 revised Where does the energy lost due to light emission come from? added 156 characters in body; edited title Feb 18 comment Where does the energy lost due to light emission come from? @ACuriousMind, I'll rephrase the question. Feb 18 comment Where does the energy lost due to light emission come from? @ACuriousMind, if I had an infrared camera, I'm sure I'll see plenty of them. Feb 18 comment Where does the energy lost due to light emission come from? @ACuriousMind, what about regular objects which are not being supplied with external energy? Like a pencil or a piece of paper. Feb 18 revised Where does the energy lost due to light emission come from? added 5 characters in body Feb 18 revised Where does the energy lost due to light emission come from? added 85 characters in body Feb 18 comment Where does the energy lost due to light emission come from? @ACuriousMind, why would it lose mass? It's my understanding that the light being radiated by an object must come from its mass. Does it not? Feb 18 asked Where does the energy lost due to light emission come from? Dec 28 accepted The speed limit is with respect to what? Dec 28 comment Why is quantum entanglement considered to be an active link between particles? @LubošMotl, the last "it" in my previous comment refered to quantum entanglement, not quantum mechanics. I understand that QM is a self-contained theory, it doesn't need another theory to make sense of it. Dec 25 comment Why is quantum entanglement considered to be an active link between particles? @LubošMotl, what I don't understand from your answer is why Einstein called this "spooky action at a distance". Is it that Quantum Mechanics wasn't a complete science back then so there was no theory to explain it yet?