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What Makes a Planet a Planet? The Story of Pluto

What makes a planet a planet? In 2006, the International Astronomical Union stripped Pluto of its planet status. Phillip Metzger, a planetary scientist at the University of Central Florida joins Hari Sreenivasan to discuss to the reasoning behind the reclassification of planets. Watch this clip from "SciTech Now."

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Nova

A to Z: How Writing Changed The World

Just as handwritten records changed how societies work, the printing press transformed the spread of information, igniting the Industrial Revolution. How did technologies -- from pen to paper to printing press -- make it all possible?

  • 2020-10-02T05:00:00-07:00
    KCET-HD
  • 2020-10-04T15:00:00-07:00
    KCET-HD
  • 2020-10-04T18:00:00-07:00
    KCET-HD

Ancient Skies

Our Place in the Universe

Complete the puzzle of our ancient skies. A cast of scientific pioneers reshapes the solar system and better understands a growing universe. But there is still much more space to explore.

  • 2020-10-02T06:00:00-07:00
    KCET-HD

Nova

Animal Espionage

Camera traps and drones are revolutionizing the study of wildlife by providing an up-close look at animals without disturbing them. See how these technologies are helping us understand everything from mysterious whale behavior to tiger migration.

  • 2020-10-09T05:00:00-07:00
    KCET-HD
  • 2020-10-11T15:00:00-07:00
    KCET-HD
  • 2020-10-11T18:00:00-07:00
    KCET-HD

Nova

Nature's Fear Factor

When top predators disappeared from Mozambique's Gorongosa National Park, other animals fell into unusual patterns. Now scientists are reintroducing wild dogs to restore the park's "landscape of fear" and with it the natural balance of the ecosystem.

  • 2020-10-16T05:00:00-07:00
    KCET-HD
  • 2020-10-18T15:00:00-07:00
    KCET-HD
  • 2020-10-18T18:00:00-07:00
    KCET-HD

Nova

Touching The Asteroid

If spacecraft OSIRIS-REx can grab a piece of an asteroid and bring it back to Earth, scientists could gain great insight into our planet's origins, and even how to defend against rogue asteroids. But NASA only gets three shots at collecting a sample.

  • 2020-10-23T05:00:00-07:00
    KCET-HD
  • 2020-10-25T15:00:00-07:00
    KCET-HD
  • 2020-10-25T18:00:00-07:00
    KCET-HD

Nova

Can We Cool The Planet?

As global temperatures rise, scientists are exploring geoengineering solutions, from planting trees to sucking carbon out of the air to physically blocking out sunlight. But would it work? And what are the risks of engineering Earth's climate?

  • 2020-10-30T05:00:00-07:00
    KCET-HD