The outermost planet, HD 40307 g, orbits comfortably in the habitable zone, where Earth-like temperatures are possible.

最外层行星HD 40307 在“适居带”轨道上运转，在这片区域内，星球表面可能有类似地球的温度。

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The Gliese 581 star has about 30% the mass of our sun, and the outermost planet is closer to its star than we are to the sun.

红矮星gliese 581只有太阳质量的30%，比起太阳系的外层行星，该系统最外层的行星距离红矮星要更近。

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Many are gaseous giants like Jupiter, others icy like our solar system's outermost planets (or in Pluto's case, former planet).

它们大多是像木星一样的气态怪物，其它的就是像我们太阳系外层行星似的寒冷(或像冥王星的情形：属于前行星)。

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If you have a little model of the solar system at home, you can break off the outermost planet.

NPR: Pluto, the Un-Planet?

Here, just so you can compare, are photos that the Hubble Space Telescope took of the planet Pluto, the outermost planet.

FORBES: iOS 6 Maps Make Me Feel Like I Live On Pluto

Occupying its outermost third is a convective zone where gas is rising and falling in planet-sized cells.

BBC: Sun, Trace