I enjoyed this video, but I wonder about Fraser’s statement that cosmologists think if you travel in one direction long enough you’ll eventually end up back where you are. That is one model, but not the only one. It depends on space being curved, and tests currently show it to be flat.
Of course, space could be curved but the curvature might be too slight to show up within the current precision of our instruments. It seems like the last I read on this indicated that this level of precision indicates that if space is curved, then the universe is at least 250 times the size of the observable universe.
None of this means that every location isn’t at the center of its observable universe. In that sense, Fraser’s statement that every location is the center of the universe still holds.
- Universe May Be Curved, Not Flat (scientificamerican.com)
- Viewpoint: Is the Lopsided Universe an Open Universe? (physics.aps.org)
- The Curvature of the Universe Explained – Video (news.softpedia.com)