Based on our current understanding/model the dark energy is pushing clusters (groups) apart. The distances between clusters are so great (and growing at such rates) that it's virtually impossible for us to ever reach another cluster.
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You're talking about the star clusters? I don't know a whole lot about dark energy or space travel. But if that were the case then we'd have to develop worm hole technology. Where there's a will, there's a way! Plus, we're getting closer and closer with teleportation, maybe something along those lines of math will help bring us closer.