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    { "id" : "http://dbpedia.org/resource/Terraforming_of_Mars"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The terraforming of Mars is the hypothetical process by which Mars's climate and surface would be deliberately changed to make large areas of the environment hospitable to humans, thus making the colonization of Mars safer and sustainable (see Planetary engineering).There are several proposed terraforming concepts, some of which present prohibitive economic and natural resource costs, and others that may be currently technologically achievable." ] ,
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          "http://dbpedia.org/resource/Colonization_of_Mars",
          "http://dbpedia.org/resource/Health_threat_from_cosmic_rays",
          "http://dbpedia.org/resource/Weightlessness",
          "http://dbpedia.org/resource/Ethics_of_terraforming" ] ,
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