National Space Science Data Center. [3 December 2013]. (原始内容存档于2022-04-05). Siddiqi, Asif A. 1958 (PDF). Deep Space Chronicle: A Chronology of Deep Space and
截至2015年10月 (2015-10)[update], the largest and most active investors in space were Lux Capital, Bessemer Venture Partners, Khosla Ventures, Founders Fund,