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Da Ufopedia.
- Menzel Donald ...t the galaxy, but not that they could easily, and routinely, travel across interstellar distances to earth." (Greenwell, 229)20 KB (2.936 parole) - 16:51, 28 set 2009
- Zubrin Robert ...colonization of the [[solar system]] and the feasibility of [[interstellar travel]] with known physics.12 KB (1.751 parole) - 08:22, 4 feb 2013
- Analogo terrestre ...ld-it-take-to-travel-to-the-nearest-star/|titolo=How Long Would it Take to Travel to the Nearest Star?|autore=Ian O'Neill|data=8 luglio 2008|editore=Universe ... Hunt|autore3= A. M. Hein|titolo=Embryo Space Colonisation to Overcome the Interstellar Time Distance Bottleneck|rivista=Journal of the British Interplanetary Soci88 KB (11.885 parole) - 07:24, 1 apr 2021
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