另一个太阳系有一颗质量是地球22倍的行星(译者：可怜的小地球)，公转周期为4天，还有一颗公转周期为3年的类木星行星。
Another solar system has a planet 22 times the mass of Earth, orbiting every four days, and a Saturn-like planet with a 3-year period.
旅行者2号是唯一一个接近我们太阳系众多神秘行星之一天王星的一艘航天器。
Voyager 2 is the only spacecraft that has flown close by to one of the more enigmatic planets in our solar system: Uranus.
广角红外线探测望远镜需要扫描天域2遍以便生成时间释放图像，天文学家将用这些图像侦测外太阳系的天体。
WISE needs to scan the sky twice in order to generate the time-lapsed images astronomers use to detect objects in the outer solar system.
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