- #1
kuahji
- 394
- 2
Basically what the title asks. I understand that there are four known forces, three of which have been unified, the other, gravity which simply doesn't want to integrate. But the reason I ask, is why isn't dark energy considered a force? I mean, if its thought to be causing the expansion of the universe, why then is it not a force? Is it simply because not enough is known about dark energy?