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Thumbnail image for "Introduction to Astronomy" featuring an illustrated Phil Plait.

Crash Course Astronomy

Welcome to school without the classroom! Join host Phil Plait and discover everything there is to know about the cosmos.

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Full Episodes
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Episode
11:09
Crash Course Astronomy

Life in the Universe: Crash Course Astronomy #46

Phil gives the course a send off with a look at some of his favorite topics.
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Episode
15:00
Crash Course Astronomy

Deep Time: Crash Course Astronomy #45

Our Universe’s days are numbered.
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Episode
12:21
Crash Course Astronomy

A Brief History of the Universe: Crash Course Astronomy #44

Thanks to the wonders of physics, we can map a timeline of the universe’s history.
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Episode
11:08
Crash Course Astronomy

Dark Energy, Cosmology part 2: Crash Course Astronomy #43

Most of the universe is made up of a mysterious entity that pervades space: dark energy.
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Episode
13:09
Crash Course Astronomy

The Big Bang, Cosmology part 1: Crash Course Astronomy #42

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING!
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Episode
11:45
Crash Course Astronomy

Dark Matter: Crash Course Astronomy #41

Today on Crash Course Astronomy, Phil dives into some very dark matters.
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Episode
13:51
Crash Course Astronomy

Gamma-Ray Bursts: Crash Course Astronomy #40

The discovery of gamma-ray bursts is an epic story.
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Episode
15:20
Crash Course Astronomy

Galaxies, part 2: Crash Course Astronomy #39

Active galaxies pour out lots of energy.
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Episode
11:51
Crash Course Astronomy

Galaxies, part 1: Crash Course Astronomy #38

Galaxies contain gas, dust, and billions of stars or more.
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Episode
10:59
Crash Course Astronomy

The Milky Way: Crash Course Astronomy #37

Today we’re talking about our galactic neighborhood: The Milky Way.
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Education
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Special
The Library of Congress National Book Festival: Celebrating American Ingenuity

The Library of Congress National Book Festival

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Clip
1:31
The Library of Congress National Book Festival: Celebrating American Ingenuity

Authors Discuss American Ingenuity

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Clip
2:12
The Library of Congress National Book Festival: Celebrating American Ingenuity

Author Amy Tan of 'The Joy Luck Club'

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Clip
1:45
The Library of Congress National Book Festival: Celebrating American Ingenuity

Former First Lady, National Book Festival Founder Laura Bush

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Episode
11:25
Crash Course: Artificial Intelligence

What Is Artificial Intelligence? #1

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Episode
14:57
Crash Course: Artificial Intelligence

Supervised Learning #2

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Episode
11:29
Crash Course: Artificial Intelligence

Neural Networks and Deep Learning #3

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Episode
12:08
Crash Course: Artificial Intelligence

Training Neural Networks #4