Crash Course is a fast, funny, irreverent look at history beginning with the Big Bang Theory. In this episode, brothers John and Hank Green gives us their take on what makes Big History so darn important. [13:55]

Learn about what happened in the Universe after the big bang. Also find out about cosmic background radiation, how hydrogen and helium turned into stars, formed galaxies, created heavy elements, and eventually created planets. [14:37]

It's time for the end. At least the end of our first series on Physics here at Crash Course. In this video episode of Crash Course Physics, Shini sits down to talk about Astrophysics and Cosmology. By using what we've learned this year,...

Video lecture explains cosmic background radiation and redshift. [10:16]

Video lecture explores cosmic background radiation and the Big Bang theory. [11:36]