CrashCourse

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. Sta...

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 y...

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 ...

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 expa...

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 univers...

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 yo...

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 ten...

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 ga...

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 hu...

Nebulae: Crash Course Astronomy #36

Astronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae a...

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 c...

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 cal...

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. St...

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 sta...

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 ...

White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30

Today Phil follows up last week’s look at the death of low mass stars with what comes next: a white dwarf. White dwarfs a...

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 ...

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 ther...

Exoplanets: Crash Course Astronomy #27

Today Phil explains that YES, there are other planets out there and astonomers have a lot of methods for detecting them. ...

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...

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 ...

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. It...

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 me...

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 ...

Comets: Crash Course Astronomy #21

Today on Crash Course Astronomy, Phil explains comets. Comets are chunks of ice and rock that orbit the Sun. When they ge...

Asteroids: Crash Course Astronomy #20

Now that we’ve finished our tour of the planets, we’re headed back to the asteroid belt. Asteroids are chunks of rock, me...

Uranus & Neptune: Crash Course Astronomy #19

Today we’re rounding out our planetary tour with ice giants Uranus and Neptune. Both have small rocky cores, thick mantle...

Saturn: Crash Course Astronomy #18

Saturn is the crown jewel of the solar system, beautiful and fascinating. It is a gas giant, and has a broad set of rings...

Jupiter's Moons: Crash Course Astronomy #17

Before moving on from Jupiter to Saturn, we’re going to linger for a moment on Jupiter’s moons. There are 67 known moons,...

Jupiter: Crash Course Astronomy #16

Jupiter is the biggest planet in our solar system. The gas giant is NOT a failed star, but a really successful planet! It...