Three of the planets fall within a temperature range that should allow water to exist on their surfaces – a placement that is sometimes referred to as “the Goldilocks zone” because it is neither too hot nor too cold. Given the right sort of atmosphere, water could also be present on three of the others.
Astronomers say a solar system 39 light-years from Earth’s harbours seven Earth-sized planets, at least three of which are in the temperature sweet spot where water (and potentially life) is possible.
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