但是因为其母体恒星就像是一个红色的小矮人——比起地球来实在是又小又模糊，因此它的运行轨道与地球相比也就小了很多。
However, since its parent star is a red dwarf-a far smaller and fainter object than the sun-that orbit is, in fact, much smaller that the Earth's around the sun.
铁路和轨道交通是两个相近的概念，它们之间边界是模糊的。
Railway and rail transit are similar concepts without clear boundary.
然后分别用一般的进化算法和改进的SPEA方法解决轨道转移的时间-能量优化问题，对于相对运动方程有限推力控制问题，本文用模糊控制的方法加以解决。
Then the paper applies EA and SPEA to an orbital transformation problem. - time-energy optimization o The paper also solve low thrust control problem of relative motion using fuzzy logic.
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