Igordabari/Alamy
Could there be a universe larger than ours, such that ours is a subatomic particle by its standards? And is it possible that, within the particles we know of, there are smaller universes?
Nick Canning
Coleraine, County Londonderry, UK
You seem to have an image of multiple universes stacked within each other like Russian dolls, but with the possibility of the number of such dolls being infinite. This isn’t how our universe works.
Our observable universe, a sphere of radius about 46.5 billion light years (enlarged from the expected 13.9 billion light years due to the continual expansion during the…
