NASACast: Solar System AudioNASA Audio Podcast episodes on Cassini, Mars missions and other missions exploring our solar systemSputnik: The Beep Heard Round the World, The Birth of the Space Age- October 2, 2007 Fifty years ago, launch of the Russian Sputnik satellite triggered the space race with America, which launched its own satellite, Explorer 1, shortly afterwards.http://www.nasa.gov/multimedia/podcasting/jpl-sputnik-20071002.html |