WHY IS THERE A MOON? .... and more!

If annotations aren't working use the links below! CGPGrey: http://www.youtube.com/watch?v=rNu8XDBSn10 /Tom: http://youtube.com/tom Where's My Challenge: http://www.youtube.com/user/WheresMyChallenge#p/u/2/GnH2AJxU4jk History of our solar system:…