98 6. THE PAST
Table 6.3: A cosmic calendar compresses the entire history of the universe into one calendar year
Event
t (s)
Date Time
End of Planck era 1.0 × 10
-43
January 1 0 h, 0 m, 10
-53
s
End of infl ation era 1.0 × 10
-35
January 1 0 h, 0 m, 10
-43
s
Proton-neutron ratio fi xed
1.00 January 1 0 h, 0 m, 10
-10
s
End of fusion era
180 January 1 0 h, 0 m, 10
-8
s
Time of decoupling 1.2 × 10
13
January 1 00:14
Re-ionization begins 2.1 × 10
16
January 18
Formation of Milky Way 2.4 × 10
17
January 21
Formation of Sun 2.81 × 10
17
August 25
Formation of Earth 2.89 × 10
17
September 1
Dark energy era begins 3.00 × 10
17
September 10
T. rex 4.32 × 10
17
December 27 09:00
First humans 4.35 × 10
17
December 31 23:52
End of last ice age 4.35 × 10
17
December 31 23:59:33
e present (t
0
)
4.35 × 10
17
December 31 Midnight
6.6 REFERENCES
Alan H. Guth. Inflationary universe: A possible solution to the horizon and flatness problems.
Physical Review D, 23:347–356, January 1981. DOI: 10.1103/PhysRevD.23.347 91
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