This 700-million-year-old formation gives few clues to the origins of modern animals, however, because paleontologists believe it represents an evolutionary experiment that failed.

然而，这个7亿年历史的地层几乎不能为现代动物的起源提供任何线索，因为古生物学家认为它代表的是一个失败的进化试验。

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Not only can scientists now identify what types of planets exist, they can see how common each type is, yielding clues into the enigmas of planetary formation.

现在科学家不仅能识别行星的存在形式，还能够了解每种类型的数量，找出行星构造之谜的线索。

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Many areas of the lunar South Pole are literally frozen in time, holding preserved clues to the formation of our solar system.

月球南极的很多地区都保留着古老的地理线索，对研究太阳系的形成很有帮助。

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In 2006, Dr. Dabiri co-authored a study, involving 120 participants, which suggested that the process of vortex-ring formation could offer important clues about cardiac health.

WSJ: Jellyfish Hints at Fix for Damaged Hearts

But the second planet may yield more valuable clues about the formation of solar systems and the universe.

CNN: Astronomers spy new neighbors outside solar system