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PBS Space Time

Season 2025 · Episode 23

The Gravity Particle Should Exist. So Where Is It?

0.023mNovember 13, 2025

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?

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Episodes

Episode 1How Many Black Holes Are In The Solar System?
Episode 2Does Timescapes DISPROVE Dark Energy?
Episode 3The Crisis in Physics: Why the Higgs Boson Should NOT Exist!
Episode 4The Final Barrier to (Nearly) Infinite Energy
Episode 5Will The Big Bang Happen AGAIN (and Again)?
Episode 6Your DNA Is (Almost Certainly) From Outer Space
Episode 7How Astrophysics Can (LITERALLY) Save the World
Episode 8NEW EVIDENCE: Earth Had Rings (and Might Regain Them)
Episode 9Why Didn’t Antimatter Destroy The Universe? | LHC Breakthrough
Episode 10Quantum Energy Teleportation is REAL!
Episode 11Is There A Simple Solution To The Fermi Paradox?
Episode 12Is Our Model of Dark Energy WRONG? | New 4.2σ Results
Episode 13The Crisis In Physics: Are We Missing 17 Layers of Reality?
Episode 14Are The Fundamental Constants Finely Tuned? | The Naturalness Problem
Episode 15How Did SPACE Shape Your DNA?
Episode 16Why The Multiverse Could Be Real
Episode 17Is There Evidence For a Vast Multiverse?
Episode 18The Most Important Satellite You’ve (Probably) Never Heard Of
Episode 19At What Point Does Spacetime Become Quantum?
Episode 20Why Life on Mars Will DOOM Humanity
Episode 21We Were WRONG About the Quantum Eraser!
Episode 22Why Antimatter Engines Could Launch In Your Lifetime
Episode 23The Gravity Particle Should Exist. So Where Is It?
Episode 24The Biggest Planet Discovery in History Is About to Begin! (Next Year)
Episode 25Heisenberg Made a Discovery in 1925. We Still Can't Explain It