HAWTHORNE-CA-MAY 29:  SpaceX CEO Elon Musk speaks with invited guests inside the manned capsule Dragon V2 after unveiling it at the company's headquarters on May 29, 2014, in Hawthorne, California. The private spaceflight company has been flying unmanned capsules to the Space Station delivering cargo for the past two years. The Dragon V2 manned spacecraft will ferry up to seven astronauts to low-Earth orbit. (Photo by Kevork Djansezian/Getty Images)