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Atlantic Crossing

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Life at the Waterhole

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Finding Your Roots

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Midsomer Murders

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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
12:01
Crash Course Astronomy

Nebulae: Crash Course Astronomy #36

Astronomers study a lot of things, but nebulae might be the most beautiful of them all.
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Episode
10:21
Crash Course Astronomy

Star Clusters: Crash Course Astronomy #35

Last week we covered multiple star systems, but what if we added thousands to the mix?
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Episode
11:46
Crash Course Astronomy

Binary and Multiple Stars: Crash Course Astronomy #34

Binary stars are gravitationally bound together in the same system.
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Episode
12:11
Crash Course Astronomy

Black Holes: Crash Course Astronomy #33

Stellar mass black holes form when a very massive star dies, and its core collapses.
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Episode
12:42
Crash Course Astronomy

Neutron Stars: Crash Course Astronomy #32

In the aftermath of a some stars we find a weird little object known as a neutron star.
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Episode
12:02
Crash Course Astronomy

High Mass Stars: Crash Course Astronomy #31

Massive stars fuse heavier elements in their cores than lower mass stars.
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Episode
11:09
Crash Course Astronomy

White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30

What comes next after the death of a low mass star? A white dwarf.
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Episode
12:02
Crash Course Astronomy

Low Mass Stars: Crash Course Astronomy #29

Today we are talking about the life -- and death -- of stars.
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Episode
11:05
Crash Course Astronomy

Brown Dwarfs: Crash Course Astronomy #28

Brown dwarfs have a mass that places them between giant planets and small stars.
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Episode
11:49
Crash Course Astronomy

Exoplanets: Crash Course Astronomy #27

There are many other planets outside of our own solar system, but finding them is tricky.
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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