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exodus by Du Moreira They say that the transition from the feeling of gravity to microgravity is one of the most agonizing parts of interplanetary travel and not just because the human body is incapable of surviving for long without gravitational references. When you leave the Earth for the first time, you leave these references behind. The struggle to disseminate notions of nation, religion, race, species, language and sex–so common and seemingly indispensable to the inhabitants of any planet–ends abruptly in the absence of gravity. Literally, gravity is what pulls us back to earth. However, the first commercial space flights illustrated that gravitational pull, or its absence, has more important implications. This is why, still today, the mechanisms of gravitational simulation, rotating on their immense axes out there in space, cannot immitate moral gravity. If gravity pulls us back to earth–our starting point–moral gravity pulls us back to tradition. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.