宇宙飞行士Sman是地球人类的后裔，但他们这代人已经对地球没有任何的记忆，就像这个时代的我们对于祖先是怎么离开非洲的那样。地球，对他们来说那只是一个三千多万年的前的小行星而已，不会有任何感情纽带。像Sman那样的地球后裔散落在宇宙的各个角落，甚至彼此都不知道对方的存在，在经历了那么多年的演化后，有些地球后裔在外形上已经出现了新的特征，很难再用人类这样的名词去形容他们。而Sman这一族离开地球并不遥远，也就一千五百多光年。他们是最接近人类的地球后裔。
The Sman is a descendant of the Earth's humanity, but their generation has no memory of the earth, just like how we left Africa for our ancestors. Earth, for them, it is just a little planet of more than 30 million years ago, there will be no emotional bond. Earth descendants like Sman are scattered in every comner of the universe, and even do not know each other's existence. After so many years of evolution, some of the descendants of the earth have already appeared in the shape of new features, it is diffcult to use humans again. The noun to describe them. The Sman family is not far away from the Earth, and it is more than 1,500 light years. They are the descendants of the earth closest to humanity.
