Science has the premise of a space time continuum in which we think of a big bang as continuing to occur so that its space is expanding within a finite amount of time between the initialization of the event and now. We might question whether or not this expansion could have had a point of origin in space if it had one in time.
According to which cosmological parameters we choose, we declare that its been between 13.784 and 13.824 Billion years plus or minus some fraction of a second since an event occurred within an empty timeless universe which had not as yet expanded, and was either finite or some form of multiverse.
Can that universe be taken as having had as its center the point in time at which the big bang occurred when we observe clusters of galaxies that were created within .6 Billion years of that event but so far non before its origin.
Science tells us Matter and Energy which are a part of the space time continuum can covert into one another following Einsteins formula of E=MC^2.
After this event space began to expand but the speed of light in a vacuum, the time it takes light to go between two point in space we consider as having remained a constant.
At the event horizon of a black hole or indeed at any gravity well space is curved or deformed differently than the ordinary expansion of space which is ongoing and continuous; and time is slowed so that there is a relation between space and time and gravity and the speed of light which is not uniform everywhere in the universe.
Since the expansion of space continues to occur uniformly everywhere throughout the universe it might be expected that it occurs uniformly at the point of origin of the big bang in time and that there is a prior to the expansion of space that point of origin of the big bang in time which could be defined as the center of the universe.
If the universe has no beginning and no center in space we should not be able to observe clusters of galaxies that were created in a time within .6 Billion years of a big bang event in any direction in which we look without associating their nearness in time to the point of origin in time as associated with a smaller less expansionist universe.