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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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 -
Could This Icy Moon’s Ocean Support Life?
Hydrothermal vents in Enceladus’ ocean may hold the promise of life.1:21 -
Enceladus: A Frozen Moon With Explosive Eruptions
Enceladus’ small size and icy surface is no limitation to its extreme volcanism.1:56 -
How the Martian Atmosphere Helped Nasa’s Rovers Restore Energy
Martian dust devils may have helped NASA’s rovers restore power during mission.2:59 -
This Tiny Moon Is a Volcanic Powerhouse
Io’s intense volcanic activity defies all expectations.2:45
