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Ancient Earth May Have Had Red Oceans

How did oxygen escape from the oceans to form Earth’s atmosphere and create breathable air? Rust played a critical role in the process.
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Clip Season 50 Episode 11 Length 03:34 Premiere: 10/04/23

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Season 50 Episodes

Lee and Liza's Family Tree
S50 E18 Length 53:30 Premiere Date 11/22/23

The Battle to Beat Malaria
S50 E17 Length 53:54 Premiere Date 11/15/23

Inside China's Tech Boom
S50 E16 Length 53:20 Premiere Date 11/08/23

Ancient Earth: Humans
S50 E15 Length 53:15 Premiere Date 11/01/23

Ancient Earth: Inferno
S50 E14 Length 53:45 Premiere Date 10/25/23

Ancient Earth: Life Rising
S50 E13 Length 53:47 Premiere Date 10/18/23

Ancient Earth: Frozen
S50 E12 Length 53:46 Premiere Date 10/11/23

Ancient Earth: Birth of the Sky
S50 E11 Length 53:47 Premiere Date 10/04/23

Your Brain: Who's in Control?
S50 E10 Length 53:20 Premiere Date 05/24/23

Your Brain: Perception Deception
S50 E9 Length 53:30 Premiere Date 05/17/23

Hidden Volcano Abyss
S50 E8 Length 53:19 Premiere Date 05/10/23

Saving the Right Whale
S50 E7 Length 53:31 Premiere Date 05/03/23

Chasing Carbon Zero
S50 E6 Length 53:31 Premiere Date 04/26/23

Weathering the Future
S50 E5 Length 53:31 Premiere Date 04/12/23

Ancient Earth May Have Had Red Oceans
Clip Length 03:34 Premiere Date 10/04/23

Ancient Earth Was a Hellscape
Clip Length 03:09 Premiere Date 10/04/23

Ancient Earth Series Preview
Preview Length 01:00 Premiere Date 09/10/23

Rare Fossil Appears to Show Mammal Attacking Dinosaur
Clip Length 03:26 Premiere Date 07/28/23

The nation’s first big offshore wind farm is coming
Clip Length 05:22 Premiere Date 07/21/23

What Made the Titan Submersible Design Unconventional?
Clip Length 05:05 Premiere Date 07/03/23

Could Whale Poop Help Cool the Planet?
Clip Length 02:43 Premiere Date 05/12/23

This Fungus Is Spreading Rapidly in Hospitals
Clip Length 03:24 Premiere Date 04/24/23

There’s Something Living in Wildfire Smoke
Clip Length 01:59 Premiere Date 04/11/23

How the West Is Making It Rain, With Science
Clip Length 06:22 Premiere Date 04/10/23

Soothing Science: The Light You See at Sunset
Clip Length 08:01 Premiere Date 04/04/23

The Mystery and Physics of the Spiral Football Pass
Clip Length 03:43 Premiere Date 02/13/23

Astronaut Walter Cunningham on the Historic Apollo 7 Mission
Clip Length 32:26 Premiere Date 01/25/23

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Your Brain: Who's in Control? - S50 E10

Dive into the latest research on the subconscious to see what's really driving the decisions you make.

  • Sunday April 12, 2026 7:00 pm ET on KET2
  • Sunday April 12, 2026 6:00 pm CT on KET2
  • Tuesday April 14, 2026 1:00 am ET on KET2
  • Tuesday April 14, 2026 12:00 am CT on KET2

Return to the Moon - S53 E8

Follow the Artemis II engineers and crew on a perilous 10-day journey to orbit the Moon.

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

Rain Bombs - S53 E5

Scientists race to understand catastrophic weather events known as "rain bombs" and how we can protect ourselves from their growing power.

  • Wednesday April 22, 2026 9:00 pm ET on KET
  • Wednesday April 22, 2026 8:00 pm CT on KET
  • Thursday April 23, 2026 5:00 pm ET on KET
  • Thursday April 23, 2026 4:00 pm CT on KET
  • Friday April 24, 2026 2:00 am ET on KET
  • Friday April 24, 2026 1:00 am CT on KET
  • Sunday April 26, 2026 7:00 pm ET on KET2
  • Sunday April 26, 2026 6:00 pm CT on KET2
  • Tuesday April 28, 2026 1:00 am ET on KET2
  • Tuesday April 28, 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 April 29, 2026 9:00 pm ET on KET
  • Wednesday April 29, 2026 8:00 pm CT on KET
  • Thursday April 30, 2026 5:00 pm ET on KET
  • Thursday April 30, 2026 4:00 pm CT on KET
  • Friday May 1, 2026 2:00 am ET on KET
  • Friday May 1, 2026 1:00 am CT on KET
  • Sunday May 3, 2026 7:00 pm ET on KET2
  • Sunday May 3, 2026 6:00 pm CT on KET2
  • Tuesday May 5, 2026 1:00 am ET on KET2
  • Tuesday May 5, 2026 12:00 am CT on KET2

Decoding the Universe: Cosmos - S51 E8

Trace groundbreaking discoveries in space research and exploration and follow the teams trying to solve two mysteries in cosmology - dark matter and dark energy.

  • Wednesday May 6, 2026 9:00 pm ET on KET
  • Wednesday May 6, 2026 8:00 pm CT on KET
  • Thursday May 7, 2026 5:00 pm ET on KET
  • Thursday May 7, 2026 4:00 pm CT on KET
  • Friday May 8, 2026 2:00 am ET on KET
  • Friday May 8, 2026 1:00 am CT on KET
  • Sunday May 10, 2026 7:00 pm ET on KET2
  • Sunday May 10, 2026 6:00 pm CT on KET2
  • Tuesday May 12, 2026 1:00 am ET on KET2
  • Tuesday May 12, 2026 12:00 am CT on KET2
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Your Brain: Who's in Control? - S50 E10

  • Friday April 10, 2026 2:00 am ET on KET
  • Friday April 10, 2026 1:00 am CT on KET
  • Thursday April 9, 2026 5:00 pm ET on KET
  • Thursday April 9, 2026 4:00 pm CT on KET
  • Wednesday April 8, 2026 9:00 pm ET on KET
  • Wednesday April 8, 2026 8:00 pm CT on KET

Your Brain: Perception Deception - S50 E9

  • Tuesday April 7, 2026 1:00 am ET on KET2
  • Tuesday April 7, 2026 12:00 am CT on KET2
  • Sunday April 5, 2026 7:00 pm ET on KET2
  • Sunday April 5, 2026 6:00 pm CT on KET2
  • Friday April 3, 2026 2:00 am ET on KET
  • Friday April 3, 2026 1:00 am CT on KET
  • Thursday April 2, 2026 5:00 pm ET on KET
  • Thursday April 2, 2026 4:00 pm CT on KET
  • Wednesday April 1, 2026 9:27 pm ET on KET
  • Wednesday April 1, 2026 8:27 pm CT on KET

Baltimore Bridge Collapse - S52 E6

  • Tuesday March 31, 2026 5:00 am ET on KET2
  • Tuesday March 31, 2026 4:00 am CT on KET2
  • Tuesday March 31, 2026 12:00 am ET on KET2
  • Monday March 30, 2026 11:00 pm CT on KET2
  • Sunday March 29, 2026 7:00 pm ET on KET2
  • Sunday March 29, 2026 6:00 pm CT on KET2
  • Friday March 27, 2026 2:00 am ET on KET
  • Friday March 27, 2026 1:00 am CT on KET
  • Thursday March 26, 2026 5:00 pm ET on KET
  • Thursday March 26, 2026 4:00 pm CT on KET
  • Wednesday March 25, 2026 9:00 pm ET on KET
  • Wednesday March 25, 2026 8:00 pm CT on KET

Pompeii's Secret Underworld - S52 E5

  • Tuesday March 24, 2026 5:00 am ET on KET2
  • Tuesday March 24, 2026 4:00 am CT on KET2
  • Tuesday March 24, 2026 12:00 am ET on KET2
  • Monday March 23, 2026 11:00 pm CT on KET2
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  • Friday March 20, 2026 2:00 am ET on KET
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  • Thursday March 19, 2026 4:00 pm CT on KET
  • Wednesday March 18, 2026 9:00 pm ET on KET
  • Wednesday March 18, 2026 8:00 pm CT on KET

The Planets: Mars - S46 E13

  • Thursday March 12, 2026 4:30 pm ET on KET
  • Thursday March 12, 2026 3:30 pm CT on KET
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