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Centaurus constellation / Spaceflight / Light sources / Stellar astronomy / Solar System / Alpha Centauri / Oort cloud / Space colonization / Proxima Centauri / Astronomy / Space / Planetary science


Our Solar System, Our  Galaxy, then the Universe  Al Globus, April 2012  Orbital Space Settlements   When thinking about space settlement, most people think in terms of cities on the Moon o
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Document Date: 2012-04-13 21:43:50


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