the idea of the ether was no longer needed this one realization that reality is not the same for different frames of reference also led to other implications of special relativity that fast moving objects appears shorter that fast moving objects appear to have increased mass and finally the equivalence of mass and energy this is the most famous equation in science e equals MC squared that means that mass and energy are equivalent so now the big question is how did eyesight come up with his most famous equation based on his original two postulates the math is rather complicated but let's just look at it conceptually there was a time when mass was always conserved in any reaction whatever mass you put in must be the mass you got out but if conservation of mass is interpreted as conservation of rest mass this did not hold true in special relativity since different observers would disagree about what the energy of a system was the mass and energy taken together must be conserved not just the mass on its own a train traveling close to the speed of light has a lot more energy than a train at rest but a person riding on the non accelerating train may not know that the train is moving so this massive object is moving from the point of view of one observer but at rest as seen by another observer one observer with and measure zero energy of the object and the other observer would measure a higher energy it turns out that for the laws of physics namely conservation of energy and conservation of momentum to be consistent in the two reference frames of two observers moving with respect to each other there has to be an energy associated with a body at rest not just a body in motion and that is what e equals mc-squared implies the M in the equation is the mass at rest all masses even at rest must have energy some people point out that much of the actual work for special relativity had already been done by the time Einstein presented it the concepts of time dilation and simultaneity for moving objects for example were already in place and the math had already been developed by people like Lawrence and Frank Ari some have even called Einstein a plagiarist there's no doubt that the revolution of Einstein was built on the shoulders of other great scientists and Einstein may have been given a lot more credit than others who did prior work at the same time Einstein still deserves the accolades because he took the bits and pieces of the puzzles found by others and put them all together into a whole new theoretical framework he rejected the idea of the ether altogether which other scientists had not done and boldly proclaimed a new fundamental understanding of time and reality and the idea of mass and energy equivalence by ad equals mc-squared is solely Einstein scientists would then prior work like Thompson the more Lawrence and Poincare II had never implied such a bold proposition and just as in life history tends to favor the old are vanish here if you like our videos and consider subscribing and ring the bell so that you can be informed when we upload more fascinating videos we make NUMBER_TOKEN to NUMBER_TOKEN videos a week I'll see you in the next video
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