# Graphical timeline of the Big Bang

It is a logarithmic scale that shows $10 \cdot \log_{10}$ second instead of second. For example, one microsecond is $10 \cdot \log_{10} 0.000 001 = 10 \cdot (-6) = -60$. To convert -30 read on the scale to second calculate $10^{-\frac{30}{10}} = 10^{-3} = 0.001$ second = one millisecond. On a logarithmic time scale a step lasts ten times longer than the previous step.