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No Dark Matter = Proof of Dark Matter?

We’ve been failing to detect dark matter for decades. Finally, the latest failure to detect dark matter may have actually proved its existence. One of these is true: either most of the matter in the universe is invisible and formed of something not explained by modern particle physics OR our understanding of gravity is completely broken. Watch this episode from "PBS Space Time."

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Upcoming Airdates

Nova

A to Z: The First Alphabet

Writing shaped civilization itself, from the trading of goods to tales of ancient goddesses and kings. Follow the evolution of the written word, from millennia-old carvings in an Egyptian turquoise mine to our modern-day alphabets.

  • 2020-09-27T15:00:00-07:00
    KCET-HD
  • 2020-09-27T18:00:00-07:00
    KCET-HD

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