I'll start; The "Dark Flow" Phenomenon.

This theory refers to the observation that galaxy clusters seem to be moving in a consistent direction with velocities that cannot be explained solely by the known gravitational forces within our observable universe.

The peculiar aspect of dark flow is that it suggests motion beyond what would be expected due to the expansion of the universe. In other words, the motion of these galaxy clusters appears to be influenced by something external to our visible universe. This observation challenges the assumption that, on large scales, the universe should be homogeneous and isotropic.

While some researchers argue that systematic errors or cosmic variance could account for the observed dark flow, others have suggested more exotic possibilities. One speculative idea is the presence of structures or influences from regions beyond our observable universe, sometimes referred to as the "multiverse."

... Yeah, the cold, dark and seemingly endless universe is a gift that truly keeps on giving... 😶‍🌫️