Just to offer an editorial comment on the marvelous state of our understanding of the universe:
1. It's been ~40 years since String Theory was proposed, and there's still not a single thing we know to be true about it. There is not one String Theory fact.
2. It's been ~30 years since Inflationary Theory was proposed, and there's still no evidence in support of it. Almost, but still nothing definitive.
4. It's been 15 years since we discovered a need for Dark Energy to exist, and we still haven't a clue what it is.
4.5 Dark Energy is 69% of what the universe is made of. There's 5-6 times more Dark Matter than regular matter, so Dark Matter is 26% of the what the universe is made of. Thus 95% of the universe is a complete and total mystery to us. Maybe even 96%. (They haven't even had time to update the chart yet.)
5. It's been ~80+ years since Quantum Theory appeared on the scene to explain how the universe is put together at the level of the very small, and it explains it perfectly, and there are legions of facts and supporting evidence, and it's never wrong and it's always right, and it still makes no sense to anybody and nobody likes it and everyone wishes it would just go away. And it's the finest scientific theory known to man.
6. It's been ~80+ years since Special and General Relativity arrived on the scene to explain how the universe is put together at the level of the very large, and they explain it brilliantly and they're always right and never wrong. And they still don't make any sense.
6.5 General Relativity led us to Black Holes and Big Bang. There are legions of facts and supporting evidence for Big Bang, and there's no evidence against it, and most scientists who really understand it are not happy with it and wish it would just go away, and most people of faith refuse to believe in it because they don't really understand it. And Black Holes don't exist. They almost exist and they'll be at the edge of existing forever, or until they evaporate, which apparently they will all do, so actually, Black Holes don't exist and never will.
7. It's been ~80+ years since General Relativity and Quantum Theory arrived on the scene to explain the way the universe works in its entirety, and they're both perfect and they're never wrong, and they're the two finest fields of science known to man, and they are still entirely incompatible and don't get along with each other.
What a great universe.