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NASA says Kepler-11 has the fullest, most compact planetary system yet discovered beyond our own.

VOA: special.2011.02.09

It's not going to Jupiter.It's going to some other planetary system.

它不是去木星，而是去其他的星系。

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But could there be intelligent life in another planetary system, in orbit around one of the 100 billion other stars in our Milky Way galaxy?

CNN: Three more homes for life in the universe?

The discovery of a true planetary system, as opposed to the solitary planets that are known to orbit a dozen or so other stars, is significant for two reasons.

ECONOMIST: Planet hunting

The habitable zone is the region of a planetary system which is neither too hot nor too cold - such that water on the surface of a planet will neither evaporate nor freeze, but instead can stay liquid.

BBC: NEWS | Science/Nature | Earth-like planets may be common