crashcourse.jpg.CROP.original original

Phil Plait (AKA the Bad Astronomer) teaches you astronomy in a series of 47 videos with English captions (and many in other languages too). Welcome to the first episode of Crash Course Astronomy. Your host for this intergalactic adventure is the Bad Astronomer himself, Phil Plait. We begin with answering a question: "What is astronomy?"

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!