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PBS Space Time

What If Gravity is Not Quantum?

Season 9 Episode 30 | 18m 32s

The holy grail of theoretical physics is to come up with a quantum theory of gravity. But after a century of trying we really have no idea how close we are, or it it's even possible. But we shouldn't feel bad because it turns out that the universe is doing everything it its power to make this as difficult as possible. Or it's telling us that it isn't. Should we take the hint?

Aired: 11/08/23
Extras
Watch • 16:28
PBS Space Time
How To Detect Faster Than Light Travel
Faster than light travel may produce gravitational waves that we could see here on Earth.
Episode: S10 E15 | 16:28
Watch • 20:07
PBS Space Time
Can a Particle Be Neither Matter Nor Force?
All particles belong to two large groups: fermions and bosons.
Episode: S10 E14 | 20:07
Watch • 16:11
PBS Space Time
Will The Sun’s Magnetic Field Flip This Year?
Just how much stronger is this year’s solar activity going to get?
Episode: S10 E13 | 16:11
Watch • 17:25
PBS Space Time
Is It Impossible To Cross The Event Horizon? | Black Hole Firewall Paradox
So you’ve decided to jump into a black hole...
Episode: S10 E12 | 17:25
Watch • 12:51
PBS Space Time
What’s The Universe’s Strongest Particle Accelerator?
We only recently figured out where cosmic rays are coming from.
Episode: S10 E11 | 12:51
Watch • 13:28
PBS Space Time
Can Black Holes Unify General Relativity & Quantum Mechanics?
Black hole complementarity may force us to rethink what it means to say that it exists.
Episode: S10 E10 | 13:28
Watch • 20:15
PBS Space Time
Interstellar Expansion WITHOUT Faster Than Light Travel
To travel the stars without faster than light travel we’re going to need a generation ship.
Episode: S10 E9 | 20:15
Watch • 16:19
PBS Space Time
What Happens If You Jump Into A Black Hole?
Today we are jumping into a black hole. Again.
Episode: S10 E8 | 16:19
Watch • 15:36
PBS Space Time
Why Is The World Rushing Back To The Moon?
The Moon: humanity’s first destination beyond our atmosphere.
Episode: S10 E7 | 15:36
Watch • 15:07
PBS Space Time
How Eclipses Revealed Our Solar System
So how did humans figure out the solar system? Eclipses!
Episode: S10 E6 | 15:07
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  • PBS Space Time Season 3
  • PBS Space Time Season 2
  • PBS Space Time Season 1
Watch • 16:28
PBS Space Time
How To Detect Faster Than Light Travel
Faster than light travel may produce gravitational waves that we could see here on Earth.
Episode: S10 E15 | 16:28
Watch • 20:07
PBS Space Time
Can a Particle Be Neither Matter Nor Force?
All particles belong to two large groups: fermions and bosons.
Episode: S10 E14 | 20:07
Watch • 16:11
PBS Space Time
Will The Sun’s Magnetic Field Flip This Year?
Just how much stronger is this year’s solar activity going to get?
Episode: S10 E13 | 16:11
Watch • 17:25
PBS Space Time
Is It Impossible To Cross The Event Horizon? | Black Hole Firewall Paradox
So you’ve decided to jump into a black hole...
Episode: S10 E12 | 17:25
Watch • 12:51
PBS Space Time
What’s The Universe’s Strongest Particle Accelerator?
We only recently figured out where cosmic rays are coming from.
Episode: S10 E11 | 12:51
Watch • 13:28
PBS Space Time
Can Black Holes Unify General Relativity & Quantum Mechanics?
Black hole complementarity may force us to rethink what it means to say that it exists.
Episode: S10 E10 | 13:28
Watch • 20:15
PBS Space Time
Interstellar Expansion WITHOUT Faster Than Light Travel
To travel the stars without faster than light travel we’re going to need a generation ship.
Episode: S10 E9 | 20:15
Watch • 16:19
PBS Space Time
What Happens If You Jump Into A Black Hole?
Today we are jumping into a black hole. Again.
Episode: S10 E8 | 16:19
Watch • 15:36
PBS Space Time
Why Is The World Rushing Back To The Moon?
The Moon: humanity’s first destination beyond our atmosphere.
Episode: S10 E7 | 15:36
Watch • 15:07
PBS Space Time
How Eclipses Revealed Our Solar System
So how did humans figure out the solar system? Eclipses!
Episode: S10 E6 | 15:07