When I heard the terms, “Dark energy & Dark matter” first, I thought it to be related to Witchcraft & Black Magic. Nope! It is not. It is from Particle Physics & Space Science.
Here is a video from TED, telling all that you want to know:
I remember, reading in School that some scientists believed that space is filled with ether. I thought that was crap, when it was actually vacuum. Now I realize, ether is nothing but Dark Matter.
This also brings back memories of the days, I hooked to the “மானுடம் வென்றது (Mankind had Won)” program on Radio.
There is lot of space in space & man will find his way into it.