The large scale structure of the universe is not with galaxies all in tidy spheres, although some galaxy clusters are. The coma cluster was the first galaxy cluster where dark matter was discovered. It needs like 10 times that much mass to keep the galaxies contained. There you go. And guess what? It does a very good job and it's winning of that.
What is nothing? Does nothing exist? Neil deGrasse Tyson and comedian Chuck Nice explore cosmological curiosities about the end of the universe, dark matter, and more!
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Photo Credit: NASA / JPL-Caltech / L. Jenkins (GSFC), Public domain, via Wikimedia Commons
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