![](http://www.newscientist.com/data/images/ns/cms/mg20026831.600/mg20026831.600-2_300.jpg)
It sounds like a simple enough wish list, but finding a planet that fulfils all of these criteria has kept astronomers busy for decades. Until recently, it meant finding a planet in the 'Goldilocks zone' - orbiting its star at just the right distance to keep surface water liquid rather than being boiled off or frozen solid."
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