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    PBS Space Time
            Does Axionic Dark Matter Bind Galaxies Together?
                
                    
                        
                            Season 9
                        
                    
                    
                        
                            Episode 18
                        
                    
                
            
            
            Quantum mechanics is our best theory of the fundamental nature of reality, but it's usually only distinguishable from familiar classical mechanics on the smallest scales. But it’s also possible that our entire galaxy is filled with a reverberating quantum mechanical wave that literally holds the galaxy together—and in fact explains all the dark matter that we see across the universe.
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