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The Mystery of Tabby’s Star

Tabby’s star flickers erratically and no one knows why—could it be an alien megastructure?
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Clip Season 45 Episode 103 Length 03:18 Premiere: 04/04/18

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Season 45 Episodes

Thai Cave Rescue
S45 E14 Length 53:34 Premiere Date 10/29/18

Addiction
S45 E12 Length 53:45 Premiere Date 09/25/18

Black Hole Apocalypse
S45 E1 Length 53:26 Premiere Date 12/06/17

Are We Alone? Preview
Preview Length 00:28 Premiere Date 04/04/18

The Mystery of Tabby’s Star
Clip Length 03:18 Premiere Date 04/04/18

Can We Use Pollution to Find Aliens?
Clip Length 02:16 Premiere Date 04/04/18

Profile: Jason Kalirai
Clip Length 06:39 Premiere Date 04/04/18

The Biggest Puzzle in Physics
Clip Length 04:41 Premiere Date 02/21/18

Wild Ways to Find a Mate
Clip Length 03:44 Premiere Date 02/14/18

What The Physics?! - Q&A
Clip Length 07:37 Premiere Date 02/14/18

What Is Blockchain?
Clip Length 03:17 Premiere Date 02/07/18

What Is Bitcoin?
Clip Length 02:14 Premiere Date 02/07/18

Seeing Quantum with the Naked Eye
Clip Length 03:55 Premiere Date 02/06/18

Can Tech Save Players’ Brains?
Clip Length 02:49 Premiere Date 02/03/18

Does the Flu Shot Work?
Clip Length 02:14 Premiere Date 01/17/18

Predicting Landslides
Clip Length 01:34 Premiere Date 01/17/18

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TV Schedules

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Secrets of the Forest - S52 E8

Scientists gather data on how forests work and try to figure out how they can help tackle the twin threats of climate change and species extinction.

  • Tuesday June 23, 2026 1:00 am ET on KET2
  • Tuesday June 23, 2026 12:00 am CT on KET2

Ancient Desert Death Trap - S52 E17

Archaeologists investigate strange Stone Age megastructures in the Arabian desert, built by a mysterious people 9000 years ago.

  • Wednesday June 24, 2026 9:00 pm ET on KET
  • Wednesday June 24, 2026 8:00 pm CT on KET
  • Thursday June 25, 2026 5:00 pm ET on KET
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  • Friday June 26, 2026 2:00 am ET on KET
  • Friday June 26, 2026 1:00 am CT on KET
  • Sunday June 28, 2026 7:00 pm ET on KET2
  • Sunday June 28, 2026 6:00 pm CT on KET2
  • Tuesday June 30, 2026 1:00 am ET on KET2
  • Tuesday June 30, 2026 12:00 am CT on KET2

Athens: Birth of Democracy - S53 E7

Archaeologists investigate the dramatic origins of democracy in ancient Greece 2,500 years ago. Mass graves and ancient ruins where tyrants were murdered shine new light on the birth of a revolutionary form of government.

  • Wednesday July 1, 2026 8:00 pm ET on KET
  • Wednesday July 1, 2026 7:00 pm CT on KET
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  • Thursday July 2, 2026 3:00 pm CT on KET
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  • Friday July 3, 2026 12:00 am CT on KET

Revolutionary War Weapons - S52 E7

American and British archaeologists and historians reveal the technology, innovation and luck that determined the outcomes of key battles of the Revolutionary War.

  • Wednesday July 1, 2026 9:00 pm ET on KET
  • Wednesday July 1, 2026 8:00 pm CT on KET
  • Thursday July 2, 2026 5:00 pm ET on KET
  • Thursday July 2, 2026 4:00 pm CT on KET
  • Friday July 3, 2026 2:00 am ET on KET
  • Friday July 3, 2026 1:00 am CT on KET
  • Sunday July 5, 2026 7:00 pm ET on KET2
  • Sunday July 5, 2026 6:00 pm CT on KET2
  • Tuesday July 7, 2026 1:00 am ET on KET2
  • Tuesday July 7, 2026 12:00 am CT on KET2

Black Hole Apocalypse - S45 E1

Premiered On: 01/10/2018

Astrophysicist and novelist Janna Levin takes viewers on a journey to the frontiers of black hole science and explores what they can tell us about the nature of space, time and gravity.

  • Wednesday July 8, 2026 9:00 pm ET on KET
  • Wednesday July 8, 2026 8:00 pm CT on KET
  • Thursday July 9, 2026 5:00 pm ET on KET
  • Thursday July 9, 2026 4:00 pm CT on KET
  • Friday July 10, 2026 2:00 am ET on KET
  • Friday July 10, 2026 1:00 am CT on KET
  • Sunday July 12, 2026 7:00 pm ET on KET2
  • Sunday July 12, 2026 6:00 pm CT on KET2
  • Tuesday July 14, 2026 1:00 am ET on KET2
  • Tuesday July 14, 2026 12:00 am CT on KET2

Black Hole Universe - S45 E2

Premiered On: 07/03/2019

Join astrophysicist Janna Levin on a mind-bending journey to the frontiers of black hole research. Discover how scientists may soon be able to "see" a black hole and are revealing new clues to the strangest and most extreme objects in the universe.

  • Wednesday July 15, 2026 9:00 pm ET on KET
  • Wednesday July 15, 2026 8:00 pm CT on KET
  • Thursday July 16, 2026 5:00 pm ET on KET
  • Thursday July 16, 2026 4:00 pm CT on KET
  • Friday July 17, 2026 2:00 am ET on KET
  • Friday July 17, 2026 1:00 am CT on KET
  • Sunday July 19, 2026 7:00 pm ET on KET2
  • Sunday July 19, 2026 6:00 pm CT on KET2
  • Tuesday July 21, 2026 1:00 am ET on KET2
  • Tuesday July 21, 2026 12:00 am CT on KET2

Chasing Pluto - S42 E13

Premiered On: 07/15/2015

The New Horizon's spacecraft will fly by and take the first detailed images of Pluto. It is the culmination of the spacecraft's nine-year, three-billion-mile journey.

  • Wednesday July 22, 2026 9:00 pm ET on KET
  • Wednesday July 22, 2026 8:00 pm CT on KET
  • Thursday July 23, 2026 5:00 pm ET on KET
  • Thursday July 23, 2026 4:00 pm CT on KET
  • Friday July 24, 2026 2:00 am ET on KET
  • Friday July 24, 2026 1:00 am CT on KET
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Recent

Secrets of the Forest - S52 E8

  • Sunday June 21, 2026 7:00 pm ET on KET2
  • Sunday June 21, 2026 6:00 pm CT on KET2
  • Friday June 19, 2026 2:00 am ET on KET
  • Friday June 19, 2026 1:00 am CT on KET
  • Thursday June 18, 2026 5:00 pm ET on KET
  • Thursday June 18, 2026 4:00 pm CT on KET
  • Wednesday June 17, 2026 9:00 pm ET on KET
  • Wednesday June 17, 2026 8:00 pm CT on KET

Alaskan Dinosaurs - S48 E21

  • Tuesday June 16, 2026 1:00 am ET on KET2
  • Tuesday June 16, 2026 12:00 am CT on KET2
  • Sunday June 14, 2026 7:00 pm ET on KET2
  • Sunday June 14, 2026 6:00 pm CT on KET2
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  • Thursday June 11, 2026 4:00 pm CT on KET
  • Wednesday June 10, 2026 9:00 pm ET on KET
  • Wednesday June 10, 2026 8:00 pm CT on KET

Can Dogs Talk? - S53 E3

  • Tuesday June 9, 2026 1:00 am ET on KET2
  • Tuesday June 9, 2026 12:00 am CT on KET2
  • Sunday June 7, 2026 7:00 pm ET on KET2
  • Sunday June 7, 2026 6:00 pm CT on KET2

Great Mammoth Mystery - S49 E3

  • Tuesday June 2, 2026 1:00 am ET on KET2
  • Tuesday June 2, 2026 12:00 am CT on KET2
  • Sunday May 31, 2026 7:00 pm ET on KET2
  • Sunday May 31, 2026 6:00 pm CT on KET2
  • Friday May 29, 2026 2:00 am ET on KET
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  • Wednesday May 27, 2026 9:00 pm ET on KET
  • Wednesday May 27, 2026 8:00 pm CT on KET

When Whales Could Walk - S51 E1

  • Tuesday May 26, 2026 1:00 am ET on KET2
  • Tuesday May 26, 2026 12:00 am CT on KET2
  • Sunday May 24, 2026 7:00 pm ET on KET2
  • Sunday May 24, 2026 6:00 pm CT on KET2
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