The second and final part of our series on LIGO explores how the interferometer at LIGO works and how we can use it to listen in on the universe. http://www.youtube.com/watch?v=vMKPOJxHpcY Written by Jessica Karch Animated and Illustrated by Maxine Nelson Narrated by Ciara McGovern Special thanks to Brian Dawes Music Credit: "New Sound" from Bensound.com