The most recent observations of the most distant galaxies suggest that those galaxies, seen when the universe was much younger than it is now, were expanding much more slowly than we would expect. That means that the expansion has been accelerating, which is possible only if there is a force pushing outward on the matter. The current interpretation of the observations suggests that this repulsive force is as much as three times stronger than the attraction of gravity in the expansion of the universe. The cosmological constant has been re-introduced, even though most astronomers are extremely reluctant to do so. It is possible that further analysis and refinement will show that the universe is not accelerating.
Theorists are also busy testing other interpretations of the results.
I expect that the most likely outcome of this rather confusing state of affairs is that new and unexpected ideas will emerge. Exciting things are about to be discovered. Who knows where they will lead us.