Surface of a planet with an astronaut | Still from "Nova: Back to the Moon"

The Planets: Inner Worlds

The rocky planets - Mercury, Venus, Earth and Mars - were born of similar material around the same time, yet only one supports life. Were Earth's neighbors always so extreme? Is there somewhere else in the solar system where life might flourish?

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Full Episodes

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Pluto and Beyond

Join the mission as the New Horizons spacecraft attempts to fly by NASA's most distant target yet. Since it explored Pluto in 2015, New Horizons is zooming toward Ultima Thule, an object four billion miles from Earth.

  • 2019-08-18T12:00:00-07:00
    KCET-HD

The Planets: Ice Worlds

In the far reaches of the solar system, Uranus and Neptune dazzle with unexpected rings, supersonic winds and dozens of moons. And NASA's New Horizons gets a stunning up-close view of Pluto before venturing deep into the Kuiper Belt.

  • 2019-08-18T14:00:00-07:00
    KCET-HD
  • 2019-08-18T17:00:00-07:00
    KCET-HD

Why Sharks Attack

In recent years, an unusual spate of deadly shark attacks has gripped Australia, resulting in five deaths in 10 months. At the same time, great white sharks have begun appearing in growing numbers off the beaches of Cape Cod, Massachusetts, not far from the waters where Steven Spielberg filmed the ultimate shark fright film, Jaws. What's behind the mysterious arrival of this apex predator in an area where they've rarely been seen for hundreds of years? Are deadly encounters with tourists inevitable?

  • 2019-08-25T14:00:00-07:00
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  • 2019-08-25T17:00:00-07:00
    KCET-HD

Lethal Seas

A deadly recipe threatens the survival of countless creatures throughout Earth's oceans. We've known for years that oceans absorb about a quarter of the carbon dioxide in our atmosphere. With carbon emissions sharply rising, the silent killer is entering the seas at a staggering rate - raising the oceans' acidity. As a result, the skeletons and shells of marine creatures that form the foundation of the web of life are dissolving.

  • 2019-09-01T15:00:00-07:00
    KCET-HD
  • 2019-09-01T18:00:00-07:00
    KCET-HD

Rise of the Superstorms

Dive into the devastation wrought by Hurricanes Harvey, Irma and Maria. How can scientists better predict these storms, and what does the 2017 season tell us about the likelihood of similar storms in the future?

  • 2019-09-08T15:00:00-07:00
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  • 2019-09-08T18:00:00-07:00
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Treasures of the Earth: Gems

Gemstones like diamonds, rubies, opal and jade are the ultimate treasures. Delve into Earth's depths to discover how these precious stones are forged and what explains the unique allure of each captivating gemstone.

  • 2019-09-15T15:00:00-07:00
    KCET-HD
  • 2019-09-15T18:00:00-07:00
    KCET-HD