Why can't we point the centre of the universe from inflation graph we see? This question is not about whether it makes sense to have a centre of the universe or not instead, it's about the inflation graph we used to see while describing the Big Bang. From the inflation graph (drawn above), it's clear that the universe is supposed to have a centre at somewhere around &quot;The yellow point&quot;. Still why do we say that the universe has no centre or universe has it's centre at each point of it.
What's the problem with the figure or my understanding?
That diagram does not depict the entire universe. At most, it depicts the history of what is now our observable universe (specifically, a 2D slice through it), with us at the center only because we're observing it. Someone at the furthest reaches of that portion of the universe would see us at the furthest reaches of their observable universe, and themselves at the center.
And like us, they would observe the universe to be expanding away from them, and doing so equally in all directions. This, as far as we can determine, is true for anywhere within the observable universe. The simplest assumption is that it continues to do so outside it as well, and there is no evidence that it does anything else.