Why is our universe the way it is?

[DaveC426913]

Could be a big way. Possibilities are endless. The things you mention could happen. All ten dimensions could be macro-sized.

Unfortunately, 99.99% of configurations result in universes where nothing interesting can form - like even atoms - they'll be just formless, energized space. Or, you might get Earth-sized "atoms", but they can't form molecules.

This is why it appears our universe is exquisitely tuned. So many dials are set just so.

 

[Chronos]

Still, it more interesting to ask why our universe is so finely as to permit us observers to marvel at its mysteries. Dumb luck is always a possibility, but, not very satisfactory. I'm the devil's advocate, We all can agree our universe has these and those propoperties - but why?