How did scientists determine the size of the universe?
Photometric redshift estimates give approximations to the distances
of the most distant objects, in billion light year (Bly) units, .
The maximum is estimated as 13.77 billion light years. This is just the
distance between the farthest and the Earth.
Earth is not the center of our universe, but at the fringe..
So, there are reasons for the surmise that the center is away at
about 13.77 Bly.
At any instant, the Earth is in one of the infinite directions, from the
So, the size is 2 X 13.77 Bly.