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As for question 1, GR predicts that a universe that is effectively homogenously distributed in space should expand or collapse, such a universe would have to be amazingly well balanced in order to be static. When the matter is homogeneously distributed, then the effect of gravity can be reduced to one equation governing the average distance between ideal objects: their initial "velocity" apart from each other is counterbalanced by the gravity pulling them together.This brings us to question 2, since we can't really see objects being pulled apart by dark energy because dark energy works mostly at the scale of cosmology. The "ideal objects" I mentioned above are the size of galaxy clusters or even superclusters for our universe at the scale of cosmology.