It is talking about how big the now observable universe was at the beginning of the big bang. It’s not talking about the entire universe. The observable universe is a perfect but finite sphere. So think of a sphere with a 2 meter to 20 kilometer diameter at the beginning inflating to sphere that now has an 880 yottameter (10^24 meters) diameter.
The evidence seems to indicate that the universe is flat and infinite. Maybe it has a very slight curve and we don’t have the technology to see it yet, but the evidence doesn’t show that. It shows that it is flat.
It is talking about how big the now observable universe was at the beginning of the big bang. It’s not talking about the entire universe. The observable universe is a perfect but finite sphere. So think of a sphere with a 2 meter to 20 kilometer diameter at the beginning inflating to sphere that now has an 880 yottameter (10^24 meters) diameter.
The evidence seems to indicate that the universe is flat and infinite. Maybe it has a very slight curve and we don’t have the technology to see it yet, but the evidence doesn’t show that. It shows that it is flat.