Law of conservation of energy; energy can neither be created nor destroyed; rather, it can only be transformed from one form to another.
All the energy-momentum we have now was here at the big bang, and before that--no one can say for sure.
Second law of thermodynamics
The law that entropy always increases holds, I think, the supreme position among the laws of Nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwell's equations — then so much the worse for Maxwell's equations. If it is found to be contradicted by observation — well, these experimentalists do bungle things sometimes. But if your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.
— Sir Arthur Stanley Eddington, The Nature of the Physical World (1927)
“Energy cannot be created or destroyed, it can only be changed from one form to another.”
― Albert Einstein
Foundations of cosmology are in question. The universe is speeding up in its expansion, and galaxies are spinning so fast that they should be tearing apart, but lo they are not! Scientists had to imagine dark mass and dark energy to make the theories fit the observations… Think about that. Or don’t… your choice, perhaps.
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