If you haven't already seen this video, take less than 5 minutes of your life - AND CHANGE IT FOR EVER. You will realize how truly massive the universe is and why I have loved astronomy since I was a child. Somehow I missed this video when it originally made the circuit back in 2009; but now I've found it I'm completely enthralled. http://www.youtube.com/watch?v=oAVjF_7ensg
