Also known as mass-energy equivalence, equivalence of mass and energy, Einstein formula
physical law relating mass to energy
Mass-energy equivalence is the physical law stating that mass and energy are interchangeable—they're different forms of the same thing, expressed by Einstein's famous equation E=mc². This matters because it explains how tiny amounts of mass can be converted into enormous amounts of energy, which is the principle behind nuclear power and nuclear weapons.
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Mass near the M87* black hole is converted into a very energetic astrophysical jet, stretching five thousand light-years. In physics, mass–energy equivalence is the relationship between mass and energy in a system's rest frame. The two differ only by a multiplicative constant and the units of measurement. The principle is described by the physicist Albert Einstein's formula:
E = m
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