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Astronomy: Big Bang

World Book Online

World Book Online Advanced

The Big Bang: Crash Course Big History #1

CrashCourse.  “The Big Bang: Crash Course Big History #1.” Online Video Clip. YouTube. YouTube, 17 Sept 2014. Web. 18 Oct 2015.  < https://www.youtube.com/watch?v=tq6be-CZJ3w>

Exploring the Universe: Crash Course Big History #2

CrashCourse.  “Exploring the Universe: Crash Course Big History #2.” Online Video Clip. YouTube. YouTube,  24 Sept 2014. Web.  18 Oct 2015.  < https://www.youtube.com/watch?v=Fi30zjQhtWY>.