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PBS Space Time

The Gravity Particle Should Exist. So Where Is It?

Season 11 Episode 16 | 21m 31s

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?

Aired: 11/12/25
Extras
Watch • 21:17
PBS Space Time
Do We Live in the Rarest Solar System In The Universe? We're about to find out!
We’ve found lots of “habitable” worlds but we don’t know what factors are needed for life.
Episode: S11 E17 | 21:17
Watch • 23:22
PBS Space Time
We Were Wrong About the Quantum Eraser!
Does quantum mechanics allow the future to retroactively influence the past or not?
Episode: S11 E14 | 23:22
Watch • 19:52
PBS Space Time
Why Antimatter Engines Could Launch In Your Lifetime
Antimatter drives sound like science fiction, but they may not be as far as you think.
Episode: S11 E15 | 19:52
Watch • 19:14
PBS Space Time
Why Life on Mars Will Doom Humanity
Life on mars could result in humanity’s destruction via Fermi Paradox.
Episode: S11 E13 | 19:14
Watch • 19:01
PBS Space Time
At What Point Does Spacetime Become Quantum?
How to build a particle collider the size of the solar system.
Episode: S11 E12 | 19:01
Watch • 12:39
PBS Space Time
The Most Important Satellite You’ve (Probably) Never Heard Of
One of the most important reasons we go to space is to know our own planet better.
Episode: S11 E11 | 12:39
Watch • 16:18
PBS Space Time
Is There a Simple Proof For a Vast Multiverse?
Is there evidence for the existence of an enormous number of other universes?
Episode: S11 E10 | 16:18
Watch • 17:14
PBS Space Time
Why The Multiverse Could Be Real
Can something that exists be bad science?
Episode: S11 E9 | 17:14
Watch • 18:56
PBS Space Time
Why Is All DNA Right Handed?
It may be that our very DNA inherited its twist from the underlying handedness of reality.
Episode: S11 E8 | 18:56
Watch • 17:21
PBS Space Time
Are The Fundamental Constants Finely Tuned? | The Naturalness Problem
Did God have any choice in creating the world? So asked Albert Einstein
Episode: S11 E7 | 17:21
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  • PBS Space Time Season 6
  • PBS Space Time Season 5
  • PBS Space Time Season 4
  • PBS Space Time Season 3
  • PBS Space Time Season 2
  • PBS Space Time Season 1
Watch • 21:17
PBS Space Time
Do We Live in the Rarest Solar System In The Universe? We're about to find out!
We’ve found lots of “habitable” worlds but we don’t know what factors are needed for life.
Episode: S11 E17 | 21:17
Watch • 23:22
PBS Space Time
We Were Wrong About the Quantum Eraser!
Does quantum mechanics allow the future to retroactively influence the past or not?
Episode: S11 E14 | 23:22
Watch • 19:52
PBS Space Time
Why Antimatter Engines Could Launch In Your Lifetime
Antimatter drives sound like science fiction, but they may not be as far as you think.
Episode: S11 E15 | 19:52
Watch • 19:14
PBS Space Time
Why Life on Mars Will Doom Humanity
Life on mars could result in humanity’s destruction via Fermi Paradox.
Episode: S11 E13 | 19:14
Watch • 19:01
PBS Space Time
At What Point Does Spacetime Become Quantum?
How to build a particle collider the size of the solar system.
Episode: S11 E12 | 19:01
Watch • 12:39
PBS Space Time
The Most Important Satellite You’ve (Probably) Never Heard Of
One of the most important reasons we go to space is to know our own planet better.
Episode: S11 E11 | 12:39
Watch • 16:18
PBS Space Time
Is There a Simple Proof For a Vast Multiverse?
Is there evidence for the existence of an enormous number of other universes?
Episode: S11 E10 | 16:18
Watch • 17:14
PBS Space Time
Why The Multiverse Could Be Real
Can something that exists be bad science?
Episode: S11 E9 | 17:14
Watch • 18:56
PBS Space Time
Why Is All DNA Right Handed?
It may be that our very DNA inherited its twist from the underlying handedness of reality.
Episode: S11 E8 | 18:56
Watch • 17:21
PBS Space Time
Are The Fundamental Constants Finely Tuned? | The Naturalness Problem
Did God have any choice in creating the world? So asked Albert Einstein
Episode: S11 E7 | 17:21