On Friday, Germany, the largest and most influential member of the euro zone, poured a degree of cold water on the hopes for more aggressive action by the ECB.

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Astronomers call the most promising of these places "Goldilocks planets, " because they orbit in a temperate zone not too hot and not too cold to support liquid water essential for carbon-based life as we know it.

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The lower house was built to be the play zone, with a swimming pool, massage room, steam room, sauna, cold plunge and Jacuzzi.

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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