Why Do Comets Have Tails?
Season 51
Episode 12
About the Episode
Worlds that exist close to the warmth of the sun, like the rocky worlds of Mars, Earth and our moon, have relatively little ice, because they lie inside what is known as the ice line.
Aired:
| Expires: | Runtime: 55s
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Extras
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Why Hot Peppers Set Your Mouth on Fire
The chemical that makes chili peppers so hot evolved to keep animals from eating the plants.4:02 -
Flight Turbulence Is Actually Getting Worse
It’s not all in your head - flights really are bumpier these days.1:48 -
Hunt for the Oldest DNA: Extended Version
Follow the quest to recover DNA millions of years old for the very first time.1:24:39 -
Lost Tombs of Notre Dame Preview
Mysterious bodies are found under one of the world’s most famous cathedrals.0:30 -
Building Stuff: Change It! Preview
From electric flight to artificial noses, engineers are finding new ways to preserve our planet.0:30 -
Creating a Robotic Double Dutch Machine
Blending innovation and culture, engineers bring a robotic Double Dutch machine to life.5:08 -
Building Stuff: Reach It! Preview
Humans are born to roam. See how engineers are inventing new ways to explore and extend our range.0:30 -
Could Mars Have a Ring Around It One Day?
The moon Phobos has a mysterious origin but a certain expiration date.2:16 -
Cameras Capture Earthbound Meteorite
Some large meteorites survive their descent through our atmosphere and land on Earth.1:39 -
This Moon May Have the Ingredients for Life
The ocean beneath Europa’s icy shell might be an ideal environment for life.2:14
