这些在太阳系之外的行星，被我们称之为系外行星。
These planets outside our solar system are called exoplanets.
美国国家航空航天局表示，天文学家使用地面望远镜搜寻在太阳系之外的行星，发现了上百个不同的天体。
According to NASA, "Astronomers using ground-based telescopes to hunt for planets outside our solar system, dubbed extrasolar planets, have nabbed more than a hundred alien worlds."
行星CoRoT - 7b，是第一颗被证实的由岩石组成的在太阳系之外的行星，但它看起来并不像一个特别舒适的生存地点。
This planet, CoRoT-7b, was the first confirmed rocky world outside our solar system, but it doesn't look like a particularly pleasant place to live.
在远离太阳的外太阳系，在木星轨道之外，温度低到足以使冰从水以及甲烷和二氧化碳等气体中形成。
Far from the sun, in the outer solar system, beyond Jupiter's orbit, temperatures are low enough to permit ices to form out of water and out of gases like methane and carbon dioxide.
迄今为止，在天文学家已经发现的200颗左右太阳系之外的行星中，除了一颗，其他都不合适。
All but one of 200-or-so planets outside the solar system discovered by astronomers so far would be quite unsuitable.
在我们的太阳系之外是否存在着智慧生命？
Are there intelligent species living far beyond our solar system?
2007年9月发射的曙光号一直在成为第一个进入地球之外两个太阳系系统目的地的轨道的路上。
Dawn, which launched in September 2007, is on track to become the first spacecraft to orbit two solar system destinations beyond Earth.
天文学家在Gliese 581周围已经发现了六颗行星——除了我们的太阳系之外，Gliese 581是人类发现行星最多的行星系。
Astronomers have now found six planets in orbit around Gliese 581 - the most discovered in a planetary system other than our own solar system.
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.
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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