Neil deGrasse Tyson explains why he thinks Russian space weapon 'makes… CNN 0 120 02.22 08:16 https://www.youtube.com/watch?v=5acObLzKml4 + 122 https://www.youtube.com/feeds/videos.xml?channel_id=UCupvZG-5ko_eiXAup… + 19 Neil deGrasse Tyson explains why he thinks Russian space weapon 'makes no tactical sense'