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 * The theory of rela[[image:Einstein_in_elevator.jpg align="right" caption="Einstein experimenting with gravity in an elevator"]]tivity is a difficult subject to understand because it is made up of special relativity, general relativity, and the reasons to why they are so important.**

**In just one night, Einstein was the man who created the brilliant concept of relativity. As more myths were appearing, the more he found it interesting. He spent a lot of time experimenting with his ideas and would compare his previous predictions to the end results. As him and others started to compare Einstein’s theory with the universe, they came up with many more predictions. In the end, Einstein had a final ideal of what relativity was.**

Gravity can be based upon many things, but in this case, Einstein was mainly referring to the “essence of gravity.” At first, Einstein was comparing gravity and motion with time and space. This was called special relativity, which was his earlier thoery. He discovered that gravity and motion affected the intervals of time and space. Special relativity is also known as "equivalence principle," which is gravity pulling in one direction and is exactly equivalent to an acceleration in the opposite direction. For example, when a car accelerates forward, gravity pushes you back. Also, when an elevator accelerates going up, gravity make it feel like you are being pushed down. These are just two simple experiments Einstein concluded with special relativity. (NOVA Einstein's Big Idea)

Another type of relativity theory Einstein discovered was called general relativity. This was actually the very first one he created since Isaac Newton invented his hundreds of years ago. General relativity is a bit harder of a concept to understand compared to special relativity. Einstein had many interesting predictions for this and did a few experiments. One theory he came up with is that if gravity is equal to acceleration, then they must affect the measurements of time and space just as motion does. For example, clocks tick at a slower pace when they are closer to a gravitational force mass like the sun. Many of Einstein's ways and such in his theory's are still hard to figure out. A lot of it just has to do with the universe in all. (NOVA Einstein's Big Idea)

Einstein was a genius for creating the theorems of relativity. They are so important because if he never would of done it, then probably no one would of, at least for a much longer time. It all started out with the general relativity theorem, too. In just one night, "Einstein discovered that light rays from distant stars were deflected by the gravity of the sun, and in just the amount he predicted." It basically explains how gravity and forces work within the universe. Gravitational force is just a part of every day life that people don't even realize, that's why it is so important as well.

If Einstein wouldn't of been the mastermind behind all these theories of relativity, then it could of been many, many years later until someone else took charge of this extremely hard- understanding topic. Relativity is a big subject, and there's still so much mystery to be unsolved. Einstein just cleared up all the basics, but went into detail about many of his myths as well. He did many experiments that showed how gravity and acceleration worked together and how that linked with relativity. It helps a lot to be able to see what is going on rather than to just hear about it. Relativity will never fully be uncovered but has a pretty good meaning and understanding all due to Albert Einstein.

__Works Cited__ Lightman, Alan. "NOVA | Einstein's Big Idea | Relativity (Lightman Essay) | PBS." __PBS__. 5 Feb. 2009 .

This website talks about "Einstein's Big Idea," and contains a lot of information about many of his myths and theorys on relativity. Some main topics you can read about that Einstein had studied were the essence of gravity, collapsed stars, and just how he connected relativity with evolution of the universe. This website also includes pictures, animations, and quotes to help you understand Einstein's brilliant ideas. It really gives you a good idea about what relativity was about, or at least what Einstein had believed it was.

__Works Cited__ "Theory Of Relativity." __Theory of Relativity__. 5 Feb. 2009 .

This website is a valuable website because it includes many facts and details about Einstein and his predictions. This site seems like it has a lot of solid information, and gives many descriptive examples. The pictures and animations also help to understand the theory of relativity and how it works.