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All Seasons

Season 1

  • S01E01 The Fastest

    • February 15, 2009
    • National Geographic

    In the vast expanse of space, nothing matters more than speed. Whether we’re venturing out to the farthest reaches of our solar system or exploring the mysteries of time travel and wormholes, speed is the key.

  • S01E02 The Biggest and Smallest

    • February 15, 2009
    • National Geographic

    From the enormous universe in which we exist to tiny atoms that make up the building blocks of everything around us, size matters when it comes to understanding the cosmos.

  • S01E03 The Most Explosive

    • February 15, 2009
    • National Geographic

    Scientists believe that our universe started with a colossal explosion called the Big Bang. That powerful blast created all the matter and energy in the universe and laid the groundwork for every explosion since.

Season 2

  • S02E01 Cosmic Collisions

    • April 1, 2010
    • National Geographic

    The collisions that created Earth and the moon; the people who work to stave off the apocalypse; violent impacts deep in the cosmos.

  • S02E02 Stellar Storms

    • April 8, 2010
    • National Geographic

    Earth's weather is compared to that of other planets; cataclysmic space weather that could cripple life on Earth.

  • S02E03 Alien Contact

    • April 15, 2010
    • National Geographic

    Are we alone? It's an age-old question that was relatively "taboo" in mainstream science until the mid-1990s, when astronomers found planets outside our solar system. Now, Known Universe joins the hunt for alien life as scientists search for planets with similar characteristics to Earth's. We'll take you on a journey to find planets that may support life and show you new space-based technologies that aid in the search for advanced alien civilizations.

  • S02E04 Decoding The Skies

    • April 29, 2010
    • National Geographic

    Our ancestors' relationship with the heavens led to some of mankind's ancient discoveries and greatest creations. The ancient Greeks discovered Earth was round; the Polynesians used the sun and stars to navigate vast oceans in simple canoes; some think amazing structures like Stonehenge were designed to observe the sky. Now, Known Universe examines mankind's first observations of the cosmos to understand how they put us on the path to modern discovery.

  • S02E05 Final Frontiers

    • May 6, 2010
    • National Geographic

    More than 70 percent of Earth is covered in water, but we've only explored roughly 5 percent of it. We've roamed even less of our solar system. Now, armed with some of the latest advances in technology, we join scientists on a voyage into the unknown - from the far reaches of space to the extreme depths of our oceans - where new discoveries have experts questioning everything we know about the universe, and ultimately ourselves.

  • S02E06 Cosmic Fury

    • May 13, 2010
    • National Geographic

    Earthquakes and volcanoes pose an unpredictable and deadly threat here on Earth, but they also occur far out in the universe. What can we learn from these interplanetary phenomena that may help us predict when Mother Nature will next unleash her fury? Scientists are looking to Io, a moon of Jupiter that is jam-packed with volcanoes, for insights. Then we'll travel deep under the Earth's crust to see the physical source of these catastrophic events.