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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Chapters:
Introduction 00:00
What is Astronomy? 3:00
Who Studies Astronomy? 3:50
Origins of Astronomy 5:27
Astrology vs Astronomy 6:19
Geocentrism 7:51
Revolutions in Astronomy 8:58
Astronomy Today 10:26
Review 11:29

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Photos:
http://commons.wikimedia.org/wiki/Fil...
http://en.wikipedia.org/wiki/Earth%27...
http://en.wikipedia.org/wiki/Geomagne...
http://en.wikipedia.org/wiki/Saturn#m...
http://en.wikipedia.org/wiki/243_Ida#...
http://commons.wikimedia.org/wiki/Fil...
http://solarviews.com/raw/comet/kuipe...
http://solarviews.com/cap/comet/kuipe...
http://en.wikipedia.org/wiki/List_of_...
http://www.slate.com/blogs/bad_astron...
http://www.slate.com/blogs/bad_astron...
http://en.wikipedia.org/wiki/Black_ho...
http://commons.wikimedia.org/wiki/Fil...
http://www.slate.com/blogs/bad_astron...
http://upload.wikimedia.org/wikipedia...
http://www.slate.com/blogs/bad_astron...
http://www.esa.int/spaceinimages/Imag...
http://en.wikipedia.org/wiki/Andromed...
http://en.wikipedia.org/wiki/Triangul...
http://en.wikipedia.org/wiki/Hubble_S...
http://www.slate.com/blogs/bad_astron...
http://www.slate.com/blogs/bad_astron...
http://en.wikipedia.org/wiki/Nicolaus...
http://en.wikipedia.org/wiki/Tycho_Br...
http://en.wikipedia.org/wiki/Johannes...
http://en.wikipedia.org/wiki/Isaac_Ne...
http://en.wikipedia.org/wiki/Galileo_...
http://www.slate.com/blogs/bad_astron...