就像寿命一样，不同生物的新陈代谢率与身体质量有着固定的数学关系。
Like the life span, the metabolic rate has for different organisms a fixed mathematical relationship to the body mass.
由于我们这样的行星的寿命是几十亿年，我们可以预测，如果我们星系中有其他生物生存，它们的年龄将从零到几十亿岁不等。
Since the lifetime of a planet like ours is several billion years, we can expect that, if other civilisations do survive in our galaxy, their ages will range from zero to several billion years.
直到不久前，这些研究都仅限于一些在基因上与人类相距甚远的短寿命生物。
Until fairly recently, the studies were limited to short-lived creatures genetically distant from humans.
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