Astronomy is weird. Everything we study is really, really far away. So far away really, that for most of history we didn’t know how far away they were.

Along with Crash Course Astronomy, there’s going to be a new U.S. government series hosted by Craig Benzine (aka WheezyWaiter).

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.

It’s an example of an astronomical cycle visible to the naked eye, and the first of three subjects in Episode 3 of Crash Course Astronomy, a new series by Bad Astronomy’s Phil Plait.