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Cosmos

Season 1, episode 4. This player now records resume state for the active profile so browse, account, and detail pages can bring you back here quickly.

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S1 E4

A Sky Full of Ghosts

An exploration of how light, time and gravity combine to distort our perceptions of the universe. We eavesdrop on a series of walks along a beach on summer nights in the year 1809. William Herschel, whose many discoveries include the insight that telescopes are time machines, tells bedtime stories to his young son, John, who will grow up to make some rather profound discoveries of his own.

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A Spacetime Odyssey

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Episode 1: Standing Up in the Milky Way

Episode 2: Some of the Things that Molecules Do

Episode 3: When Knowledge Conquered Fear

Episode 4: A Sky Full of Ghosts

Now playing

Episode 5: Hiding in the Light

Episode 6: Deeper, Deeper, Deeper Still

Episode 7: The Clean Room

Episode 8: Sisters of the Sun

Episode 9: The Lost Worlds of Planet Earth

Episode 10: The Electric Boy

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Episode 11: The Immortals

Episode 12: The World Set Free

Episode 13: Unafraid of the Dark