But humans would not fare well on planet K2-18b despite wispy clouds and huge red sun

A faraway planet in the constellation of Leo has been named the most habitable known world beyond the solar system after astronomers detected water vapour in its atmosphere.

It is the first time a planet in its star’s “Goldilocks zone” – where the temperature is neither too hot nor too cold for liquid water to exist – has been found to bear the life-sustaining substance in the blanket of gases that surround it.

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