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

Forty-eight episodes, more than eight hours of content, 100,000 words, a year and a half of work, topics ranging from quantum fluctuations to the death of the Universe, and 12 million views … finally, ...

Before saying anything else, can we all please take a moment and savor the fact that Episode 42 of Crash Course Astronomy is all about how the Universe and everything got started? Lovely. So, yes, ...

Astronomy isn’t just for “Big Bang Theory” enthusiasts. But unfortunately, so many of us take for granted the endless swath of protection and ever-changing colors and shapes over our heads, until ...

Phil gives the course a send off with a look at some of his favorite topics. 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 ...