El universo de Stephen Hawking [viaje en el tiempo]

Hola les traigo uno de los capitulos del programa de Stephen Hawking: El viaje en el Tiempo link: http://www.youtube.com/watch?v=dlJkHI3nJvg&feature=related link: http://www.youtube.com/watch?v=HQ_ND5JhT9k&feature=related link: http://www.youtube.com/watch?v=XBbvdCs8eHA&feature=related link: http://www.youtube.com/watch?v=L1-xwL3Crf8&feature=related link: http://www.youtube.com/watch?v=FaXHB6FhhgY&feature=related link: http://www.youtube.com/watch?v=SVCIBHe7xv4&feature=related link: http://www.youtube.com/watch?v=onjKvLrGswU&feature=related