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Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, ...

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 ...

The Milky Way is our neighborhood in the universe. It's a galaxy and there are many others out there. Galaxies contain gas, dust, ...

Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with ...

Massive stars fuse heavier elements in their cores than lower-mass stars. This leads to the creation of heavier elements up to iron.

Today Phil's explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a ...

In the aftermath of an 8-20 solar mass star's demise, we find a weird little object known as a neutron star. Neutron stars are ...

This week we build on our naked eye observations from last week and take a look at the cyclical phenomena that we can see at ...

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

Today Phil explains how telescopes work and offers up some astronomical shopping advice. Check out the Crash Course ...

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

How do astronomers make sense of the vastness of space? How do they study things so far away? Today Phil talks about ...

We've covered a lot of incredible stuff, but this week we're talking about the weirdest objects in space: BLACK HOLES.

Mercury is the closest planet to the sun. It has no atmosphere and is, as such, covered in craters. It's also incredibly hot but, ...

Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn't ...

Phil starts the planet-by-planet tour of the solar system right here at home, Earth. Check out the Crash Course Astronomy solar ...

Here it is, folks: the end. In our final episode of Crash Course Astronomy, Phil gives the course a sendoff with a look at some of his ...

Phil takes us for a closer (eye safe!) look at the two-octillion ton star that rules our solar system. We look at the sun's core, plasma, ...

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

The fourth planet from the sun and the outermost of the terrestrial planets, Mars has long been a popular spot for missions and ...