Another Goldilocks Zone Planet

"This discovery shows that habitable planets could form in a greater variety of environments than we previously considered," says Dr Simon O'Toole of the Australian Astronomical Observatory, who was also involved in the study.

French astronomers in May last year confirmed the first exoplanet, Gliese 581d, to meet key requirements for sustaining life. It is a rocky planet about 20 light-years away.

Swiss astronomers reported in August that another planet, HD 85512 b, about 36 light-years away seemed to be in the habitable zone of its star.

The US space agency NASA confirmed its first such planet late last year, Kepler 22b, about 600 light-years away.

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