Dark Energy Horizon Explains Galaxy Mergers Stalling Beyond c #shorts

Added: 2026-05-27

[00:00:00]What if galaxy collisions just stop?

[00:00:03]Scientists studying the dark energy horizon think that's exactly what happens. When two galaxies start to merge, gravity pulls them together, but the expansion of space keeps pushing everything apart. That push grows stronger as the universe ages. So, eventually the merging pair can't cross the dark energy horizon anymore.

[00:00:23]Beyond that boundary, [music] even strong gravity can't win, and the drama turns into a slow drift. This matters because it explains why huge mergers were common early on, but stall later.

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