It tells us that mass and energy are related, and, in those rare instances where mass is converted totally into energy, how much energy that will be. The elegance with which it ties together three disparate parts of nature-energy, the speed of light and mass-is profound.
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E=mc squared
mc squared.
E = MC squared means that Energy is equal to Mass times a Constant (which is the speed of light) squared.
mc squared
Einstein figured out this formula: Energy equal mass * 89,875,517,800,000,000 mtr²/sec²