The universe as a whole is ultimately a closed system--there is no magic source of matter, energy, light, or indeed lunch, that does not draw resources from something else, and will not eventually be exhausted.
The universe as a whole is ultimately a closed system. There is no magic source of matter. There is no magic source of energy. There is no magic source of light. There is no magic source of indeed lunch. No magic source of matter, energy, light, or indeed lunch does not draw resources from something else. No magic source of matter, energy, light, or indeed lunch will not eventually be exhausted. TANSTAAFL means this. This is in the sciences.