Why the universe may be teeming with aliens: "Rocky planet outside of our solar system. Must not be too hot or too cold, but just the right temperature to support life.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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