Description Everyone knows that there are things no one can see, for example, the air you\'re breathing or a black hole, to be more exotic.
What these forces really are has been a mystery for as long as anyone has su.
One holds the Universe together while the other tears it apart.
The invisible stuff comes in two varieties--Dark matter and Dark energy.
The rest is totally invisible to us.
But not everyone knows that what we can see makes up only 5 percent of the Universe.
Description Everyone knows that there are things no one can see, for example, the air you\'re breathing or a black hole, to be more exotic