Ok I know I'm in for it here, But why is this important?
For your Ping list?
Because tomorrow the world ends, and we all want to know why.
In 1998 astronomers blew the lid off of the oscillating universe theory (first a big bang occurs, galaxies fly away from each other then slow down, slower and slower then gravity starts pulling them together again until they collide together and BOOM another big bang) because they discovered that the expanding galaxies were not slowing down, but actually accelerating aqwy from each other faster and faster.
Previous theories were tossed out, and new ones were needed.
One prominent theory suggested that there was additional matetr out there beyond the galaxies and the gravitation of that unseen matter is pulling the galaxies away faster and faster.
The frantic search for the elusive "dark matetr" began.
It has been one of the greatest hunts in the history of physics.
Now, apparently the hunt is over.
But.....
They really do not understand the nature of this exotic stuff. It is not like normal matter. Some theories suggest it is actually matter at the intersection of other dimensions, neither totally in our dimensions nor in the other dimensions.
Kinda like light which has properties of both matter and electromagnetic waves at the same time.
This is very big news.
The bigger question is why it is important to understand the world we live in.