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PBS Space Time

Is Our Model of Dark Energy Wrong? | New 4.2σ Results

Season 11 Episode 5 | 19m 03s

The biggest news in cosmology in recent years is that the mysterious universe-accelerating entity we call dark energy may be fading away. The evidence for this is now strong enough that enormous effort is going into confirming this result. So what’s it going to take, and when are we going to know?

Aired: 05/28/25
Extras
Watch • 18:33
PBS Space Time
The Particle We’ve Been Chasing for 30 Years Might Not Exist
The universe thrums with quantum fields, except something may be missing: the sterile neutrino.
Episode: S11 E20 | 18:33
Watch • 18:42
PBS Space Time
The Universe Itself Might Be Hiding the Gravity Particle From Us
Gravitons, the particle of quantum gravity, may be impossible to detect.
Episode: S11 E19 | 18:42
Watch • 1:38:18
PBS Space Time
Black Holes. Explained. For 1.5 Hours.
We go in depth on black holes: the strangest objects in the universe!
Special: 1:38:18
Watch • 25:02
PBS Space Time
Heisenberg Made a Discovery in 1925. We Still Can't Explain It
2025 was the international year of quantum science, but today we examine its origins.
Episode: S11 E18 | 25:02
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 • 21:31
PBS Space Time
The Gravity Particle Should Exist. So Where Is It?
What is the graviton, and does it even exist?
Episode: S11 E16 | 21:31
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
Latest Episodes
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  • PBS Space Time Season 8
  • PBS Space Time Season 7
  • 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 • 18:33
PBS Space Time
The Particle We’ve Been Chasing for 30 Years Might Not Exist
The universe thrums with quantum fields, except something may be missing: the sterile neutrino.
Episode: S11 E20 | 18:33
Watch • 18:42
PBS Space Time
The Universe Itself Might Be Hiding the Gravity Particle From Us
Gravitons, the particle of quantum gravity, may be impossible to detect.
Episode: S11 E19 | 18:42
Watch • 25:02
PBS Space Time
Heisenberg Made a Discovery in 1925. We Still Can't Explain It
2025 was the international year of quantum science, but today we examine its origins.
Episode: S11 E18 | 25:02
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 • 21:31
PBS Space Time
The Gravity Particle Should Exist. So Where Is It?
What is the graviton, and does it even exist?
Episode: S11 E16 | 21:31
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