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The Universe is Expanding

The Universe is Expanding

Video
2:56
The Marine Chronometer

The Marine Chronometer

Video
2:09
Shattering the Spheres

Shattering the Spheres

Video
2:16
Cannon Shot to the Moon

Cannon Shot to the Moon

Video
2:04
Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:35
Tuberculosis: The Forgotten Plague

Tuberculosis: The Forgotten Plague

Season 6 Episode 5
26:49
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Ancient Skies

Earth-Centered Cosmos

Explore ancient astronomer Ptolemy's model of the cosmos, which placed the Earth at the center of everything.
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