There may be something wrong with our models of the cosmos. The matter in the universe is getting clumpier and clumpier over time but it appears to be happening more slowly than expected. This ...

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Study suggests the universe may not be uniform in all directions. Cosmic microwave background shows slight directional imbalance. If confirmed, current cosmological models may need major revisions.

Like humans, galaxies can’t stand to be alone. Nudged by gravity, galaxies tend to group together, and some even end up in the universe’s equivalent of bustling megacities: clusters of up to a ...