小行星带探测任务将造访太阳系形成时期的衍生物
3:A mission to the asteroid belt will visit leftovers from the solar system’s formation
在某些方面,它类似于C型小行星,前身从太阳系形成中遗留下来。
In some respects it resembles a 'C-type' asteroid, a primitive body left over from the formation of the solar system.
最近有证据指出,45亿年前太阳系形成的时候,彗星有液态的核。
Recent evidence suggests that when the solar system formed 4.5 billion years ago, comets had liquid cores.
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