The theory of multiple universes says that there are many universes that make up a multiverse, which is a term used to describe the set of parallel universes, and we live in one of these many universes. Matter can organize itself in so many ways, so it has to start repeating itself. This means that if you could see into other universes you could see infinite versions of yourself. Physicist Brian Greene thinks string theory plays an important role in understanding the theory. Strings are really small one-dimensional objects that vibrate in ten or eleven dimensions. String theory incorporates gravity, so it could be a theory for everything. Brian Greene states that "Einstein's theory of relativity does a fantastic job of explaining big things." “Quantum mechanics is great for the other end of the spectrum, for small things.” “The big problem is that every theory is great for every domain, but when they compare, they are fierce antagonists and the mathematics collapses.” String theory irons out the mathematical differences between string theory and quantum mechanics. Brian Greene states: “Within string theory, the strings we are talking about are not the only entities allowed by this theory. It also allows objects that look like large flying carpets or membranes, which are two-dimensional surfaces. And what this means, in the context of string theory, is that we may be living on one of those gigantic surfaces, and there may be other surfaces floating out there in space.” the idea that parallel universes exist. These universes are connected to ours and branch from ours and our universe branches from other universes....... middle of paper ......d Max Tegmark of MIT.Works CitedGreene, Brian. "A physicist explains why parallel universes can exist." NPR. NPR and Web. November 13, 2013. .Moskowitz, Clara. “5 Reasons We Might Live in a Multiverse.” Space.com. Np, nd Web. 13 November 2013. .What is the multiverse." manyuniverses.com. Np, nd Web. 13 November 2013. . "String theory." Wikipedia. Wikimedia Foundation, nd Web. 13 November 2013. . "String theory. " Wikipedia. Wikimedia Foundation, nd Web. 13 November 2013. "String theory." Wikipedia. Wikimedia Foundation, nd Web. 13 November. 2013. .