The description of ghosts seems to defy any physics we know. Therefore, our physics is inadequate or ghosts really don't exist.
However, if we are to keep within physics as we know it, ghosts cannot be composed of energy because, as Einstein put it, energy IS mass. And the issue of ghosts having mass is the whole reason I'm confused.
Also think about this: if ghosts come from humans and have mass, where were they when the person was alive? A dead person must lose weight upon death.
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