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Space Out With These Classic Full Episodes

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The Molecule That Made Our World

The Molecule That Made Our World

At this very moment, you could be breathing the same oxygen molecule that Genghis Khan did! NGC takes you on the extraordinary journey of a single molecule of oxygen.

Do Parallel Universes Exist?

Do Parallel Universes Exist?

Parallel universes have haunted science fiction for decades, but a surprising number of top scientists believe they are real.

Decoding the Skies

Decoding the Skies

Known Universe examines mankind's first observations of the cosmos to understand how they put us on the path to modern discovery.

The Biggest and Smallest

The Biggest and Smallest

From the enormous cosmos to the infinitesimal atom, the universe is a place of extreme sizes.

Violent Star Death

Violent Star Death

The violent demise of stars in our galaxy produce amazingly beautiful supernova.

Accurate Greek Astronomy

Accurate Greek Astronomy

Even in ancient times, the Greeks were remarkably exact in both astronomy and engineering.

The Expanding Universe

The Expanding Universe

It's possible that the 'dark energy' that feeds the expanding universe could one day rip the planet apart.

Alien Contact

Alien Contact

Are we alone? Known Universe joins the hunt for alien life as scientists search for planets with similar characteristics to Earth's.