Astronomers have spotted another candidate for a potentially habitable planet - and it is not too far away. The star HD 40307 was known to host three planets, all of them too near to support liquid water. But research to appear in Astronomy and Astrophysics has found three more - among them a super-Earth seven times our planet's mass, in the habitable zone where liquid water can exist. Many more observations will be needed to confirm any other similarities. HD 40307, which lies 42 light-years away, is not particularly Sun-like - it is a smaller, cooler version of our star emitting orange light. But it is subtle variations in this light that permitted researchers working with the Rocky Planets Around Cool Stars network to find three more planets around it.
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