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Dark Matter

Dark Matter is the most prominent mass in the universe. It is a mass that does not give off heat or light, so it is very hard to detect. Dark matter is detected by a technique called gravitational lensing, in which light from a distant galaxy is distorted into created mirror images of the distant galaxy. This method is effective because dark matter has a gravitational pull. Dark matter is made up of gas clouds that contain diffuse amounts of helium and hydrogen. There are two sizes that dark matter is classified in, MACHOs (massive compact halo objects) and WIMPs (weakly interacting massive particles).

http://www.naturalhistorymag.com/features/141330/dark-matter?page=2

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