Hi all; hope this is the right place to ask a question.
I hear a lot about the "shape" of the Universe and really can't find a good explanation of what is meant.
I assume that if it were possible to look at it from the outside, the Universe would be a sphere radiating out and expanding from the big bang centre?
So, when astronomers say the Universe is saddle-shaped, what do they mean? I'm a graphic designer so need the answer described so as I can visualise it - if that's is even possible. How can a 3D space have a 2D shape?