Watch this course video
12 minutes
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?"
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Table of Contents:
What is Astronomy? 3:00
Who Studies Astronomy? 3:50
Origins & Developments 6:52
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Photos:
commons.wikimedia.org/wiki/File:Earth_cutaway.png
en.wikipedia.org/wiki/Earth%27s_magnetic_field
en.wikipedia.org/wiki/Geomagnetic_storm
en.wikipedia.org/wiki/Saturn