There’s a Cosmic Horizon We Can Never Cross

There’s a Cosmic Horizon We Can Never Cross Somewhere far beyond everything we can see is a boundary created by the expansion of the universe. Galaxies can exist beyond it, yet their light may never reach Earth. In this video, we uncover what the darkest parts of the sky are really telling us, why the universe doesn’t glow despite containing trillions of galaxies, and how astronomers discovered an astonishing amount of hidden cosmic structure. The universe isn’t just enormous—it may be fundamentally beyond our ability to see.