The planets move around the sun in ellipses.
各行星围绕太阳按椭圆形运转。
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This jet-like process propels these objects around the solar system, but because comets propel themselves while being pulled around by the gravitational forces of the solar system, their orbits are eccentric and not always easily calculated.
这种类似喷气的过程驱动着彗星围绕着

运行,但因为彗星在被加速同时也被

的引力所束缚着。因此他们的轨道格外古怪,往往难以计算。