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# The Gravity Particle Should Exist. So Where Is It?
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/the-gravity-particle-should-exist-so-where-is-it-qhc4ks/
- Published: 2025-12-31T17:01:38.000Z
- Updated: 2025-12-31T17:19:47.000Z
- Description: What is the graviton, and does it even exist?
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 11, Episode 16, #ZZZ_Episode_39a40635-3a3e-4f8b-823d-3e6a26a1e1d8, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

Physics is this close to understanding the entire universe. And what lives in this gap? Many physicists think it’s the elusive graviton—the quantum particle of gravity—whose discovery will finally allow us to stitch together our two great theories of nature into a single master theory. But what is the graviton, and does it even exist?