the journey to pluto, the farthest world ever explored - alan stern Published 6 years ago • 3M plays • Length 6:10 Download video MP4 Download video MP3 Similar videos 55:52 alan stern - the exploration of pluto by new horizons 5:26 what happens if you cut down all of a city's trees? - stefan al 24:45 pluto: the frozen world 5:17 the life cycle of a neutron star - david lunney