A planet with conditions that could support life orbits a twin neighbour of the sun visible to the naked eye, scientists have revealed.
The planet is one of five thought to be circling Tau Ceti, a star just 12 light years away which is almost identical to the sun.
Astronomers estimate the Tau Ceti planets to be two to six times bigger than Earth.
One of them, with five times the Earth’s mass, lies in the star’s “habitable zone”.
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