#Astronomy

Outtakes #5: Crash Course Astronomy 04:52

Outtakes #5: Crash Course Astronomy

One last round of laughs with Phil as he struggles through some Bad Astronomy.

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Everything, The Universe...And Life: Crash Course Astronomy #46 11:22

Everything, The Universe...And Life: Crash Course Astronomy #46

Here it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a send off with a look at some of his favorite topics and the big questi

A Brief History of the Universe: Crash Course Astronomy #44 12:35

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

Thanks to the wonders of physics, astronomers can map a timeline of the universe’s history. Today, Phil’s going to give you an overview of those first

Outtakes #2: Crash Course Astronomy 03:56

Outtakes #2: Crash Course Astronomy

Time for another Bad Astronomy break.

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PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Follow Phil on Twitter: https://twitter.com/badastronomer

Want to f

Deep Time: Crash Course Astronomy #45 15:14

Deep Time: Crash Course Astronomy #45

As we approach the end of Crash Course Astronomy, it’s time now to acknowledge that our Universe’s days are numbered. Stars will die out after a few t

Dark Energy, Cosmology part 2: Crash Course Astronomy #43 11:22

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

The majority of the universe is made up of a currently mysterious entity that pervades space: dark energy. We don’t know exactly what it is, but we do know that

Outtakes #1: Crash Course Astronomy 03:57

Outtakes #1: Crash Course Astronomy

After 10 information-heavy episodes, it's time for a little Bad Astronomy.

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PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Follow Phil on Twitter: ht

The Big Bang, Cosmology part 1: Crash Course Astronomy #42 13:22

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

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows u

Outtakes #4: Crash Course Astronomy 04:39

Outtakes #4: Crash Course Astronomy

Sometimes even Phil has a hard time with Astronomy. Time for another Bad Astronomy break!

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The Milky Way: Crash Course Astronomy #37 11:13

The Milky Way: Crash Course Astronomy #37

Today we’re talking about our galactic neighborhood: The Milky Way. It’s a disk galaxy, a collection of dust, gas, and hundreds of billions of stars,

Dark Matter: Crash Course Astronomy #41 11:59

Dark Matter: Crash Course Astronomy #41

Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn’t all there is. Galaxies and othe

Black Holes: Crash Course Astronomy #33 12:25

Black Holes: Crash Course Astronomy #33

We’ve covered a lot of incredible stuff, but this week we’re talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form w

Gamma-Ray Bursts: Crash Course Astronomy #40 14:04

Gamma-Ray Bursts: Crash Course Astronomy #40

Gamma-ray bursts are not only incredible to study, but their discovery has an epic story all its own. Today Phil takes you through some Cold War history and then dives in

Neutron Stars: Crash Course Astronomy #32 12:56

Neutron Stars: Crash Course Astronomy #32

In the aftermath of a 8 – 20 solar mass star’s demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin

Galaxies, part 2: Crash Course Astronomy #39 15:34

Galaxies, part 2: Crash Course Astronomy #39

Active galaxies pour out lots of energy, due to their central supermassive black holes gobbling down matter. Galaxies tend not to be loners, but instead exist in smaller

Outtakes #3: Crash Course Astronomy 04:32

Outtakes #3: Crash Course Astronomy

Today we're taking a break for another round of "Bad Astronomy"

Crash Course Astronomy posters available at DFTBA.com
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Galaxies, part 1: Crash Course Astronomy #38 12:05

Galaxies, part 1: Crash Course Astronomy #38

The Milky Way is our neighborhood in the universe. It’s a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more.

Nebulae: Crash Course Astronomy #36 12:15

Nebulae: Crash Course Astronomy #36

Astronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae are clouds of gas and dust in space. They can glow

Star Clusters: Crash Course Astronomy #35 10:35

Star Clusters: Crash Course Astronomy #35

Last week we covered multiple star systems, but what if we added thousands or even millions of stars to the mix? A star cluster. There are different kinds of clusters, th

Low Mass Stars: Crash Course Astronomy #29 12:02

Low Mass Stars: Crash Course Astronomy #29

Today we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years. More massive s

Binary and Multiple Stars: Crash Course Astronomy #34 12:00

Binary and Multiple Stars: Crash Course Astronomy #34

Double stars are stars that appear to be near each other in the sky, but if they’re gravitationally bound together we call them binary stars. Many stars are act

Brown Dwarfs: Crash Course Astronomy #28 11:05

Brown Dwarfs: Crash Course Astronomy #28

While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall just short of that achievement as wel

High Mass Stars: Crash Course Astronomy #31 12:16

High Mass Stars: Crash Course Astronomy #31

Massive stars fuse heavier elements in their cores than lower mass stars. This leads to the creation of heavier elements up to iron. Iron robs critical energy from the co

Stars: Crash Course Astronomy #26 10:40

Stars: Crash Course Astronomy #26

Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about

Distances: Crash Course Astronomy #25 11:20

Distances: Crash Course Astronomy #25

How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient

Light: Crash Course Astronomy #24 10:33

Light: Crash Course Astronomy #24

In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spect

Meteors: Crash Course Astronomy #23 11:21

Meteors: Crash Course Astronomy #23

Today Phil helps keep you from ticking off an astronomer in your life by making sure you know the difference between a meteor, meteorite, and meteoroid. When the Earth pl

Introduction to the Solar System: Crash Course Astronomy #9 10:16

Introduction to the Solar System: Crash Course Astronomy #9

In today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the system o

The Oort Cloud: Crash Course Astronomy #22 11:40

The Oort Cloud: Crash Course Astronomy #22

Now that we’re done with the planets, asteroid belt, and comets, we’re heading to the outskirts of the solar system. Out past Neptune are vast reservo

Tides: Crash Course Astronomy #8 09:46

Tides: Crash Course Astronomy #8

Today Phil explores the world of tides! What is the relationship between tides and gravity? How do planets and their moons become tidally locked? What would happen if you


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