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Source: Graphical timeline of the Big Bang

This timeline of the Big Bang shows a sequence of events as currently theorized.
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.