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PBS Space Time

The Universe Has Been Expanding Since the Big Bang. Just Not How We Thought.

Season 11 Episode 32 | 17m 40s

Last year, DESI made headlines when its map of the Universe suggested dark energy, the force driving cosmic expansion, might not be constant. Now, the Dark Energy Survey (DES) has released its final results. Do they confirm DESI’s findings? More importantly, why are different scientific studies far more powerful together than alone? The answer gets to the heart of how science works.

Aired: 07/15/26
Extras
Watch • 16:28
PBS Space Time
The Quantum Experiment That Breaks Time
Could sending a quantum twin across the galaxy make you both old and young at the same time?
Episode: S11 E31 | 16:28
Watch • 17:39
PBS Space Time
We Thought Black Holes Created Event Horizons. It Might Be the Opposite
It's possible that an event horizon is forming right behind and you won't know until its too late.
Episode: S11 E30 | 17:39
Watch • 20:48
PBS Space Time
We’ve Been Looking for Aliens for 70 Years. We've Been Doing It Wrong All Along
Are there no alien signals to find... or do we need to update how we search for them?
Episode: S11 E29 | 20:48
Watch • 14:27
PBS Space Time
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
Physicists hope Planck stars can save us from black hole singularities and paradoxes.
Episode: S11 E28 | 14:27
Watch • 17:41
PBS Space Time
We Found Galaxies Too Old for the Universe
Galaxies older than the universe? Webb's findings keep defying our best explanations.
Episode: S11 E27 | 17:41
Watch • 16:16
PBS Space Time
Earth’s Core Should Be Impossible. A New State of Matter Explains It.
Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Episode: S11 E26 | 16:16
Watch • 14:42
PBS Space Time
Something Disturbing Happens When You Solve Einstein's Equations This Way
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Episode: S11 E25 | 14:42
Watch • 18:46
PBS Space Time
Martian Soil Is Deadly. And That's Why It Might Support Life
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.
Episode: S11 E24 | 18:46
Watch • 18:18
PBS Space Time
Is the LHC Creating Dark Matter?
The Higgs boson may open a portal to hidden particles that could explain dark matter.
Episode: S11 E23 | 18:18
Watch • 19:02
PBS Space Time
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
The universe expands faster. “Dark energy” may not be constant after all.
Episode: S11 E22 | 19:02
Latest Episodes
All
  • All
  • PBS Space Time Season 11
  • PBS Space Time Season 10
  • PBS Space Time Season 9
  • 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 • 16:28
PBS Space Time
The Quantum Experiment That Breaks Time
Could sending a quantum twin across the galaxy make you both old and young at the same time?
Episode: S11 E31 | 16:28
Watch • 17:39
PBS Space Time
We Thought Black Holes Created Event Horizons. It Might Be the Opposite
It's possible that an event horizon is forming right behind and you won't know until its too late.
Episode: S11 E30 | 17:39
Watch • 20:48
PBS Space Time
We’ve Been Looking for Aliens for 70 Years. We've Been Doing It Wrong All Along
Are there no alien signals to find... or do we need to update how we search for them?
Episode: S11 E29 | 20:48
Watch • 14:27
PBS Space Time
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
Physicists hope Planck stars can save us from black hole singularities and paradoxes.
Episode: S11 E28 | 14:27
Watch • 17:41
PBS Space Time
We Found Galaxies Too Old for the Universe
Galaxies older than the universe? Webb's findings keep defying our best explanations.
Episode: S11 E27 | 17:41
Watch • 16:16
PBS Space Time
Earth’s Core Should Be Impossible. A New State of Matter Explains It.
Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Episode: S11 E26 | 16:16
Watch • 14:42
PBS Space Time
Something Disturbing Happens When You Solve Einstein's Equations This Way
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Episode: S11 E25 | 14:42
Watch • 18:46
PBS Space Time
Martian Soil Is Deadly. And That's Why It Might Support Life
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.
Episode: S11 E24 | 18:46
Watch • 18:18
PBS Space Time
Is the LHC Creating Dark Matter?
The Higgs boson may open a portal to hidden particles that could explain dark matter.
Episode: S11 E23 | 18:18
Watch • 19:02
PBS Space Time
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
The universe expands faster. “Dark energy” may not be constant after all.
Episode: S11 E22 | 19:02