Elon Musk Talks SpaceX Mars Colony Ships and More in Reddit AMA

SpaceX Chief Executive Elon Musk provided some additional details on Sunday (Oct. 23) about a Mars transportation system he unveiled last month, including plans to test in the near future one of its key technologies. In an "Ask Me Anything" discussion on the website Reddit, organized on short notice, Musk answered more than a dozen questions posed by users about the Interplanetary Transport System he announced in a Sept. 27 speech at the International Astronautical Congress in Mexico.