The distance between galaxies is worse than you think - Leonard Susskind Explains

That crowded deep field image from James Webb? Most of those galaxies are already beyond our reach forever — and the rest are leaving. In this video, Leonard Susskind stands at the chalkboard and walks you through the brutal reality of an expanding universe. Space itself is stretching. Distant galaxies aren't moving through space — space is growing between us and them, and at large enough distances, that growth exceeds the speed of light. No Special Relativity violation. Just geometry, doing damage. Then comes dark energy. Lambda. The cosmological constant Einstein abandoned and the universe quietly kept. It is accelerating the expansion, shrinking our Cosmic Event Horizon, and guaranteeing that every galaxy outside our Local Group will one day send its last photon, cross the horizon, and vanish into permanent darkness. We are living in a narrow window of cosmic history where the evidence is still visible, the light is still arriving, and the full story of the universe can still be read. That window is closing. This is not a video about beautiful galaxies. It is a video about what we are losing — and why right now is the only time any civilization could ever know what we know. Subscribe for physics that does not look away from the hard conclusions. #Cosmology #ExpandingUniverse #HubbleFlow #DarkEnergy #CosmicHorizon #LeonardSusskind #JamesWebbTelescope #TheoreticalPhysics #SpaceScience #UniverseFate #FasterThanLight