In the episode "", it is stated that Zefram Cochrane of Alpha Centauri, the discoverer of the space warp, disappeared 150 years ago, at the age of 87. Given Okuda's date of 2267 for that episode, this puts Cochrane's disappearance in 2117 and birth in 2030. 1980s spin-off material such as the "Star Trek Spaceflight Chronology" posit that Cochrane was from Alpha Centauri originally, and that a sub-warp ship the UNSS "Icarus" arrived at Alpha Centauri in 2048 to find he had discovered the theory behind warp drive. The "Icarus" then relayed its findings back to Earth, the first prototype warp ship was launched in 2055.