01 May 2011
YouTube Video:"Rusty Schweickart, The Asteroid Threat Over the Next 100,000 Years"
Link: YouTube Video ("Rusty Schweickart, The Asteroid Threat Over the Next 100,000 Years, SALT tak")
Link: YouTube Video ("Rusty Schweickart, The Asteroid Threat Over the Next 100,000 Years, SALT tak")