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Is Time Travel Impossible?

Is Time Travel Impossible?

Season 5 Episode 37
12:33
Why We Might Be Alone in the Universe

Why We Might Be Alone in the Universe

Season 5 Episode 38
12:24
Does Life Need a Multiverse to Exist?

Does Life Need a Multiverse to Exist?

Season 5 Episode 39
13:09
Can You Observe a Typical Universe?

Can You Observe a Typical Universe?

Season 5 Episode 40
13:36
Is The Universe Finite?

Is The Universe Finite?

Season 5 Episode 41
12:25
The Doomsday Argument

The Doomsday Argument

Season 5 Episode 42
12:50
Do Black Holes Create New Universes?

Do Black Holes Create New Universes?

Season 5 Episode 43
12:24
How To Detect a Neutrino

How To Detect a Neutrino

Season 5 Episode 44
9:54
How To Capture Black Holes

How To Capture Black Holes

Season 5 Episode 45
12:02
What if Singularities DO NOT Exist?

What if Singularities DO NOT Exist?

Season 10 Episode 1
14:44
What Happens If We Nuke Space?

What Happens If We Nuke Space?

Season 10 Episode 2
15:13
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PBS Space Time

Loop Quantum Gravity Explained

Season 5 Episode 36

It’s time we talked about loop quantum gravity. What exactly is it? What are the loops? And can it really defeat string theory in our quest for a Theory of Everything?

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Season
We’ve Been Looking for Aliens for 70 Years. We've Been Doing It Wrong All Along
20:48
Are there no alien signals to find... or do we need to update how we search for them?
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
14:27
Physicists hope Planck stars can save us from black hole singularities and paradoxes.
We Found Galaxies Too Old for the Universe
17:41
Galaxies older than the universe? Webb's findings keep defying our best explanations.
Earth’s Core Should Be Impossible. A New State of Matter Explains It.
16:16
Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Something Disturbing Happens When You Solve Einstein's Equations This Way
14:42
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Martian Soil Is Deadly. And That's Why It Might Support Life
18:46
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.
Is the LHC Creating Dark Matter?
18:18
The Higgs boson may open a portal to hidden particles that could explain dark matter.
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
19:02
The universe expands faster. “Dark energy” may not be constant after all.
Our Only Chance To Finally Unlock The Gravity Particle
16:26
There’s a new generation of experiments that may unlock the gravity particle.
The Particle We’ve Been Chasing for 30 Years Might Not Exist
18:33
The universe thrums with quantum fields, except something may be missing: the sterile neutrino.
The Universe Itself Might Be Hiding the Gravity Particle From Us
18:42
Gravitons, the particle of quantum gravity, may be impossible to detect.
Heisenberg Made a Discovery in 1925. We Still Can't Explain It
25:02
2025 was the international year of quantum science, but today we examine its origins.
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