例如，我们甚至不知道有多少恒星有行星，我们当然也不知道如果有适当的条件，生命自然出现的可能性有多大。
We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
多少恒星？他们是十四个。
这说起来似乎是一个很奇怪的因子，但是理解每年有多少恒星诞生，能让我们最终联想到每年有多少文明诞生。
A strange factor to consider perhaps, but understanding how many stars form each year allows us to ultimately consider how many civilizations are born each year.
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