[KayEyeDoubleDee]

Sure, astronomers know that about two-thirds of the universe's matter-energy content is the peculiar dark energy.
... cosmologists clamoring for clues to the dark energy's identity haven't yet solved an even older mystery, the identity of most of the universe's matter. About a third of the universe's mass-energy budget is "dark" matter, some alien form unlike the ordinary proton-and-neutron stuff making up everything on Earth.

Can someone give an armchair physics explaination of "dark energy". I understand that dark matter is hypothesized in order to explain the fact that the amount of visible matter doesn't seem to account for certain gravitationally-related phenomenon [In fact, there was an article around here just the other day concerning this]. But, what is the deal with "dark energy?" This isn't the quantum foam thing, where energy supposedly appears and disappears more or less at random out of nothing, is it?

[KayEyeDoubleDee]

Can someone ...

Okay, I got off my a$$ and did a search. Plenty of info on dark energy.

[RightWhale]

Dark energy is like gravity, except it pushes rather than pulls.