One of the (many) reasons I wanted to make the Crash Course Astronomy series was to create a resource for people. The series is set up like a supplemental astronomy class covering the same sorts of ...

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, ...

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 ...

Active galaxies pour out lots of energy. 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 ...

Throughout the year, as Earth progresses through its orbit around the sun, one can witness stars in the night sky rise and set at different times. It’s an example of an astronomical cycle visible to ...