We simply don't know what lies outside the universe.
No one knows its limits.
So, you mean the "observable physical universe".
When we take sentience into consideration, not one physical law can explain its source, function, mechanism or nature of existence.
When is your next "business trip, rich man?
Are you planning to colloborate with the other "rich businessmen" on this thread like our spaghetti clown Colonna and barking dog BMZ on a new luxury housing complex project in Marbella?
When are you planning to visit the classy Ramaswamy or Ameya restaurants in London?
Say Hi from Joel to the filthy rich owners Camellia Panjabi or her sister, Namita, since I know them personally.