Graphical timeline of the Big Bang
This timeline of the Big Bang shows a sequence of events as currently theorized by scientists. It is a logarithmic scale that shows 
  
    
      
        10
        ⋅
        
          log
          
            10
          
        
      
    
    {\displaystyle 10\cdot \log _{10}}
   second instead of second. For example, one microsecond is 
  
    
      
        10
        ⋅
        
          log
          
            10
          
        
        ⁡
        0.000001
        =
        10
        ⋅
        (
        −
        6
        )
        =
        −
        60
      
    
    {\displaystyle 10\cdot \log _{10}0.000001=10\cdot (-6)=-60}
  . To convert −30 read on the scale to second calculate 
  
    
      
        
          10
          
            −
            
              
                30
                10
              
            
          
        
        =
        
          10
          
            −
            3
          
        
        =
        0.001
      
    
    {\displaystyle 10^{-{\frac {30}{10}}}=10^{-3}=0.001}
   second = one millisecond. On a logarithmic time scale a step lasts ten times longer than the previous step.