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# What If Space is Not Empty?
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/what-if-space-is-not-empty-siuqgt/
- Published: 2024-04-02T23:12:07.000Z
- Updated: 2025-08-21T13:28:41.000Z
- Description: Spacetime on its smallest scale is an ocean of black holes and wormholes...or so we think.
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 9, Episode 23, #ZZZ_Episode_61be4e56-9f9d-420f-a438-889c306f50ad, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

Spacetime on its smallest scales is a seething ocean of black holes and wormholes flickering into and out of existence—or so many physicists think has to be the case. But why should we take this spacetime foam seriously if we’ve never seen any evidence of it?