1. The idea of colonising Mars----a world 160 times more distant than the Moon----will move decisively from the second phase to the third, when a significant number of people are living permanently in space.
    如果有相当数量的人永久性地住在太空，征服火星的计划 -- 一个比月球远160倍的星球 -- 就可以明确地从第2阶段进入第3阶段。