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

>but aren’t there any potential errors/assumptions?

Yes, tons of them. This is why the theories and models keep changing as we gather new data.