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.
在太阳系中，除流星小碎块和小行星之外，彗星也许可以说是数量最多的天体了。
Comets are probably the most numerous astronomical bodies in the solar system aside from small meteor fragments and the asteroids.
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