How do we know everything about universe with such precision?

Question

I understand that we build models and do calculations but aren’t there any potential errors/assumptions? That accumulate over multiple calculations and grow bigger the further we go back or over distance?
I.e. “At approximately 10−37 seconds into the expansion, a phase transition caused a cosmic inflation, during which the universe grew exponentially, unconstrained by the light speed invariance, and temperatures dropped by a factor of 100,000.”

In: Physics

Answer 1

The first thing is we don’t know everything about the universe. There are many many things we don’t know. We are still making discoveries, some of which voids previously “known” theories.