$课文43 宇宙中有外星人吗？

832. We must conclude from the work of those who have studied the origin of life,

根据研究生命起源的人们所作的工作，我们必然会得出这样的结论：

833. that given a planet only approximately like our own, life is almost certain to start.

如果设想有一颗行星和我们地球的情况基本相似，那几乎肯定会产生生命。

834. Of all the planets in our solar system, we ware now pretty certain the Earth is the only one on which life can survive.

我们目前可以肯定的是，在我们太阳系的所有行星中，地球是生命能存在的唯一行星。

835. Mars is too dry and poor in oxygen,

火星太干燥又缺氧，

836. Venus far too hot, and so is Mercury,

金星太热，水星也一样。

837. and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres.

除此之外，太阳系的其他行星的温度都接近绝对零度，并围绕着以氢气为主的大气层。

838. But other suns, start as the astronomers call them, are bound to have planets like our own, and as is the number of stars in the universe is so vast, this possibility becomes virtual certainty.

但是，其他的太阳，既天文学家所说的恒星，肯定会有像我们地球一样的行星。因为宇宙中恒星的数目极其庞大，所以存在着产生生命星球的这种可能性是肯定无疑的。