And at night, there are familiar constellations, planets, the odd meteor or two, and satellites streaming overhead. These are all fun to see with your unaided eyes. But there are times when a ...

Get to know host Phil Plait and begin with answering a simple question: what is astronomy? Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the ...

In our final episode of Crash Course Astronomy, Phil gives the course a send off with a look at some of his favorite topics and the big questions that Astronomy allows us to ask.

For this week’s Crash Course Astronomy episode, we take a skidding halt at the edge of the planetary solar system and scream back inward to the vast space between Mars and Jupiter. Before I go ...

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. Galaxies and other large structures in the universe ...

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.