https://www.iop.org/explore-physics/big-ideas-physics/big-bang
How did the universe start? Most physicists believe the universe was born in a big bang 13.8 billion years ago. In it, the energy making up everything in the cosmos we see today was squeezed inside an inconceivably small space – far tinier than a grain of sand, or even an atom.
***
So what do you think exists in these other dimensions that are smaller than even an atom ?
https://phys.org/news/2014-12-universe-dimensions.html
