New simulations of extrasolar planetary systems may mean the definition of "habitable" planets needs to be completely overhauled.

针对系外行星系统的最新模拟可能意味着“可居住”行星的定义需彻底颠覆。

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The next step is to find extrasolar planets in the "habitable zone" of their solar systems; planets whose size, makeup and distance from their sun might allow life to develop.

下一步是在他们的太阳系的“可以居住的地区范围”里找到太阳系以外的行星尺寸，组成部分以及和太阳的距离可以允许生命成长。

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Gravitational microlensing is probing a largely uncharted territory of extrasolar planet discovery, by finding cold rocky planets and extrasolar planetary systems resembling our own.

引力微透镜是探索未知领域基本上是太阳系外行星的发现，找到冷岩石行星和太阳系外行星系统类似于我们自己。

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Taken together, the observational and modeling results imply that many extrasolar systems harbor distantly orbiting worlds, though such planets are tough for astronomers to detect at the moment, researchers said.

MSN: Alien planets face danger from double-star systems

Just over 50 extrasolar planetary systems have so far been discovered and analysis of them shows just how unusual our local system is with its giant planets (Jupiter and Saturn) positioned well away from the Sun.

BBC: Star 'eats' a planet