[SinJin]

Dark energy is the energy that occures from vacuum fluctuations. Even when space doesn't contain any matter and appears to be empty, interactions with various fields create these fluctuations, which make up dark energy. So yeah, it says that even though we see space, or aether, as being empty and void of anything, that is only part of the picture. What is really happening is that there are anihilations of particles and anti-particles, which creates this energy.