Space Exploration

Humans Are Unlikely Ever to Encounter Alien Life. In D. Haugen & Z. Lewis (Eds.), ... "NASA Announces Design for New Deep Space Exploration System" 14 September 2011. Highfield, Roger (15 October 2001). "Colonies in space may be only hope, says Hawking". The Daily Telegraph (London). Retrieved 5 August 2007. ................
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