A Magellantv Original And Exclusive Premiere Our Galaxy Is Made Up Of Some Four Hundred Billion Stars And At Least A Hundred Billion Planetsnbsphow Many Are Like Earth With An Atmosphere Flowing Water Complex Geology And Abundant Lifenbspastronomers Are Seeking Answers In Countless Photons Racing Past The Earth And In Bold New Theories About How Planets Form And Evolve What They Are Finding Has Only Sharpened One Of The Oldest Debates In Science Is Biology A Powerful And Inevitable Byproduct Of Cosmic Evolution Or Is It Rare In A Galaxy Shaped By Violence And Mayhem