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For the first time, astronomers were able to see a string of hot gas known as a filament that is thought to be part of the mysterious underlying structure that dictates the layout of all the stars and galaxies in our universe. 

Scientists believe that matter in the universe is arranged into a gigantic web-like structure.  This is called the cosmic web. 

There are signatures of this structure in the remaining radiation from the Big Bang and in the layout of the universe itself.  Without some mysterious force pulling visible matter into this web, galaxies would be randomly scattered across the universe.  But they aren’t. 

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We can see that galaxies are found in groups and those groups come together in larger clusters. 

Computer models tell us that those galaxy clusters are linked by long filaments of hot gas and dark matter — a mystery substance that we can’t see because it doesn’t radiate or scatter light but that makes up most of the web.