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# What If the Cosmological Constant Is Not Constant?
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/what-if-the-cosmological-constant-is-not-constant-vtzmjl/
- Published: 2024-10-17T15:31:43.000Z
- Updated: 2025-08-21T13:47:11.000Z
- Description: Is Dark Energy Getting Weaker?
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 10, Episode 23, #ZZZ_Episode_b080cd35-6fc8-4668-8948-7032caec0415, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

We know that the universe is getting bigger. And we know that the speed that the universe is getting bigger is also getting bigger. The standard assumption is that the acceleration rate is itself constant, which will result in ultimate heat death. But a recent survey of primordial sound waves frozen into the way galaxies are sprinkled through the universe reveals that this fate is now in question.