> ## Content Index
> Fetch the complete content index at: https://www.cascadepbs.org/llms.txt
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# The Universe Itself Might Be Hiding the Gravity Particle From Us
- URL: https://www.cascadepbs.org/show/pbs-space-time/episode/the-universe-itself-might-be-hiding-the-gravity-particle-from-us-u4w7tk/
- Published: 2026-01-21T16:30:53.000Z
- Updated: 2026-01-21T17:00:17.000Z
- Description: Gravitons, the particle of quantum gravity, may be impossible to detect.
- Author: Cascade PBS Staff
- Tags: PBS Space Time, Season 11, Episode 19, #ZZZ_Episode_243e0ff4-e3b7-47a3-a5fc-118f113c4856, #episode, #ZZZ_Show_ae70f836-13b6-4c9d-b61f-99f7b8bc29eb, #v1.16

To progress to the next level in understanding reality, we need to combine quantum mechanics and Einstein’s general relativity. And to do that, most physicists believe we need a theory of quantum gravity which means we need gravitons.