那么讲到流星体从何而来，我们就需要讨论下彗星和小行星。
So to talk about where meteorites come from, we need to talk about comets and asteroids.
太阳是一个巨大的旋转系统的中心，这个旋转系统由九大行星、它们的卫星和无数的小天体组成，包括小行星、彗星和流星体。
The Sun is the hub of a huge rotating system consisting of nine planets, their satellites, and numerous small bodies, including asteroids, comets, and meteoroids.
科学家们想知道火卫一是被火星捕获的小行星还是在轨道上形成的星体，还想了解火卫一上是否有水或曾经有过水。
Scientists would like to know if Phobos is a captured asteroid or formed in orbit, and whether it had, or has, water.
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