内太阳系指太阳系中太阳和小行星带之间的区域。
到达距太阳半个日地距离之后，彗星会因朝着内太阳系之外急速前进而快速变暗。
After reaching about half of the Earth-Sun distance from the Sun, the comet should fade rapidly as it then heads out of the inner Solar System.
行星X于2003年进入了内太阳系之后，自从2004年以来月球的轨道就倾斜了。
The Moon has had a tilted orbit since 2004, after Planet X came into the inner solar system in 2003.
行星于2003来到你们的内太阳系，正路过太阳向外运行，它飞临地球上方的时刻还没有到来。
Planet X arrived in your inner solar system in 2003, and is riding past the Sun and now outbound, though its passage, the point when it flies overhead past Earth, is still in the future.
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