The Entire Universe Could Exist Inside a Black Hole – Here's Why (sciencealert.com)

If you’re claustrophobic, this article probably isn’t for you :)

I've seen this theory pop up a lot the past few weeks. So intriguing, so many questions!

How big would the _outer_ black hole be? Would all the mass/energy we have in our universe have to correlate to the same amount of mass/energy that went in the outer black hole? If so: would that mean the outer universe might have a lot more energy than ours?

Would that mean black holes in our universe might house little baby universes that have as much mass/energy as the star that imploded + everything that fell into the black hole?

Is it black holes all the way down... or up? What happens if our great-great-great-grand-parent-black-hole evaporates, do all the nested black holes disappear in an instant?

I would avoid these flights of fancy until we better understand dark matter and the intergalactic voids.