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    PBS Space Time
            The Origin of Matter and Time
                
                    
                        
                            Season 2
                        
                    
                    
                        
                            Episode 14
                        
                    
                
            
            
            We’ve broken down our preconceived notions about mass and time, now let’s redefine what they really are. Since we know that time is not a universal constant, what is? Matt defines causal order and explains how even though time may look different to multiple observers, it is the one concrete reality that we can all agree on.
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