Timeline of the Universe · event
Neutrino Decoupling
1 second · Very Early Universe
- Temperature (K)
- 10000000000
- When
- 1 second
- Redshift
- —
- Era
- Very Early Universe
- Seconds After Big Bang
- 1
What Happened
Neutrinos stop interacting with anything and stream freely. They are still here — a cosmic neutrino background now at 1.95 K, colder than the CMB, and still not detected directly.
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