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I'm trying to obtain a better understanding of the earliest epochs of the universe's evolution and have been looking here...

### Timeline of the Big Bang - The Big Bang and the Big Crunch - The Physics of the Universe

The Physics of the Universe - The Big Bang and the Big Crunch - Timeline of the Big Bang

www.physicsoftheuniverse.com

### Chronology of the universe - Wikipedia

en.wikipedia.org

### Brief History of the Universe

How old is the Universe and how do we know its age?

www.astro.ucla.edu

Now to my questions.

1.

Am I correct in thinking that all the listed information in these timelines about epochs

*prior*to Recombination is based upon inference and extrapolation, rather than direct observation?

2.

Hawking and Penrose's seminal paper on singularity theory, "The Singularities of Gravitational Collapse and Cosmology' https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.1970.0021, if still applicable, would apply to which epoch/s of the very early universe?

3.

mfb has kindly pointed me to these links... https://en.wikipedia.org/wiki/Big_Bang_Observer and https://arxiv.org/abs/1808.01892

My last question is therefore this. Would gravitational waves and/or neutrinos be able to probe back to the epoch/s that the Hawking - Penrose singularity theorems were designed to describe?

Many thanks in advance for any help given. Please note that my level of competence in PF is 'Basic' and I would therefore appreciate any replies being pitched at that level, please.

Thank you.

Cerenkov.