Ok this might be quite a stupid question but I can't seem to find a clear answer. The Wikipedia page on dark energy says that work done by WMAP and the Planck spacecraft indicate that the universe is made up of about 68% dark energy. But looking at the Wikipedia page titled List of unsolved problems in physics it says the following: Also, in one of the Lawrence Krauss lectures he presents the following graph: For those unaware, cosmological constant is another term for dark energy, assuming the density of dark energy never changes (as new space is created new dark energy is created with it they say). So I think my question at this point should be fairly predictable: doesn't the cosmological coincidence problem tell us that there is essentially 50% dark energy if the densities are the same? Has Krauss placed the "NOW" label slightly after where the two lines intersect in order to match the 68% dark energy estimation? If so doesn't that mean the densities don't match all that well at this point in time and there is no real coincidence?