The idea here is that - while Earth formed slowly from planetary embryos colliding - Mars is itself a solitary planetary embryo that formed very early in the history of our solar system.
2
天文学家同样可以根据他们对地球构成、活动和历史的了解来了解其他行星甚至太阳系之外的行星。
Astronomers can also use a knowledge of Earth materials, processes and history to understand other planets - even those outside of our own solar system.
3
他们记录了行星形成前，太阳系的历史，并且是第一个围绕我们原太阳的固体凝结的气体星云。
'They recorded the history of the solar system before any of the planets formed, and were the first solids to condense out of the gaseous nebula surrounding our protosun.'
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