Where Did Earth's Water Come From?

Why is Earth is a blue planet? Because it’s covered in water! Where did Earth’s water come from? Of course, water isn’t unique to our planet. The origin of water traces beyond the solar system to the earliest days of the universe. Here’s the story of the galaxy’s H2O.

Season 6 Episode 14 Length 04:13 Premiere: 05/22/18

Recent Episodes

The Intelligence Test Where Ants Beat Humans

S13 E17 Length 14:52 Premiere Date 02/05/26

Everything I Thought I Knew About Flavor Was Wrong

S13 E16 Length 19:50 Premiere Date 01/15/26

The Scientific Lie That Damaged Generations of Men

S13 E15 Length 20:05 Premiere Date 12/18/25

Inside the Vault Where They Keep the Dinosaur Apocalypse

S13 E14 Length 22:36 Premiere Date 12/04/25

Mars Used to Be Blue... Then Something Happened

S13 E12 Length 11:08 Premiere Date 10/23/25

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Length 21:29 Premiere Date 09/16/21

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Length 17:08 Premiere Date 09/01/21

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Length 20:59 Premiere Date 08/18/21

These Death-Eating Scavengers Are Real Life-Savers

Length 29:33 Premiere Date 08/04/21

Elephant Moms Carry the Wisdom of Generations

Length 25:36 Premiere Date 07/21/21

Are Some Species More Important Than Others?

Length 25:47 Premiere Date 07/08/21

The Surprising Species That Everything Else Depends On

Length 25:47 Premiere Date 07/08/21

The Superb Owl!

Length 04:11 Premiere Date 02/02/17

The 12 Days of Evolution - Complete Series!

Length 17:43 Premiere Date 01/26/17

The Surprising Origin of Thanksgiving Foods

Length 05:09 Premiere Date 11/13/16

Do Animals Mourn Their Dead?

Length 04:17 Premiere Date 10/23/16

Season 6 Episodes

Show Episodes

Show Clips & Previews

The Most Extreme Life Forms On Earth… And Beyond?

S6 E39 Length 05:24 Premiere Date 02/26/18

How to Figure Out the Day of the Week For Any Date Ever

S6 E38 Length 05:29 Premiere Date 01/16/18

Why Do We Itch (ASL)

S6 E37 Length 04:59 Premiere Date 05/18/18

Where Did Life Come From? (feat. PBS Space Time and Eons!)

S6 E37 Length 12:47 Premiere Date 05/07/18

Do Fish Pee?

S6 E36 Length 04:53 Premiere Date 12/27/18

Does Someone Else Have Your Face?

S6 E35 Length 12:42 Premiere Date 12/14/18

The Raisin Bran Effect

S6 E34 Length 05:19 Premiere Date 11/30/18

Can We Get Older Without Aging?

S6 E33 Length 08:53 Premiere Date 11/21/18

The Dinosaur On Your Thanksgiving Table

S6 E32 Length 10:16 Premiere Date 11/15/18

What is Farthest Away?

S6 E31 Length 06:08 Premiere Date 11/06/18

The Deadliest Flu Season in History?

S6 E30 Length 07:41 Premiere Date 10/31/18

The Largest River On Earth Is In The Sky

S6 E29 Length 05:30 Premiere Date 10/23/18

Where Do Teeth Come From?

S6 E28 Length 06:40 Premiere Date 10/09/18

What Do Raindrops Really Look Like?

S6 E27 Length 05:24 Premiere Date 09/25/18

Is Height Genetic?

S6 E26 Length 06:07 Premiere Date 09/18/18

Will You Still Eat Raw Fish After Watching This Video?

S6 E25 Length 06:33 Premiere Date 09/11/18

How Habits are Formed

S6 E24 Length 05:48 Premiere Date 09/04/18

How Some Words Are Forgotten

S6 E23 Length 10:49 Premiere Date 08/14/18

Why Do Disney Princesses All Look Like Babies?

S6 E22 Length 06:05 Premiere Date 08/07/18

Proof of Evolution Is Hiding in Your DNA

S6 E21 Length 08:03 Premiere Date 07/24/18

Why Do We Cry?

S6 E20 Length 04:20 Premiere Date 07/17/18

The Surprising Reason We Eat Spicy Food

S6 E19 Length 05:37 Premiere Date 07/10/18

The Science of Farts

S6 E18 Length 05:07 Premiere Date 06/26/18

Biomass - How Much Does Life on Earth Weigh?

S6 E17 Length 06:24 Premiere Date 06/20/18

What’s The Hottest Hot and Coldest Cold?

S6 E16 Length 05:11 Premiere Date 06/12/18

The Strange Evolutionary Story of the Thylacine

S6 E15 Length 07:48 Premiere Date 06/05/18