> ## Content Index
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# At What Point Does Spacetime Become Quantum?
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/at-what-point-does-spacetime-become-quantum-mt2ylo/
- Published: 2025-09-22T13:01:04.000Z
- Updated: 2025-12-25T06:30:22.000Z
- Description: How to build a particle collider the size of the solar system.
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 11, Episode 11, #ZZZ_Episode_ce515c5d-c80e-48dc-9927-5159fabe5617, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

To observe the quantum nature of gravity and of spacetime itself, we need a particle collider the size of the solar system. Or we could just physics smarter and build one on a lab bench. Here’s how.