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.

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。

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Pluto has family in the outer solar system.

冥王星在太阳系外宇宙有着它自己的家族。

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There's probably no intelligent life in the outer solar system.

也许在外太阳系根本没有智慧生命的存在。

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Some scientists have called Jupiter the protector of the inner planets and our own Earth -- from objects from the outer solar system.

VOA: special.2009.08.25

"For reasons I don't really understand the outer solar system, and the potential for life there, has not been a high priority".

BBC: Is Nasa looking in the wrong place for life?

The 1.8m (60-inch) diameter telescope on Haleakala will also spot many small, faint bodies in the outer Solar System that hid from previous surveys.

BBC: Pan-Starrs telescope begins operations to hunt asteroids

Once their missions were accomplished, they carried on into the outer reaches of the solar system.

ECONOMIST: Physics