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Planet confirmed that could have water
Kepler-22b is the first confirmed planet in the “habitable zone,” the area around a star where a planet could exist with liquid water on its surface, that has been discovered by NASA’s Kepler mission.
The planet’s radius is about 2.4 times that of the Earth. It is located about 600 light years away. Its orbital period is shorter than that of the Earth: a "year" on Kepler-22b is 290 days instead of 365.
There were two other planets confirmed this year by other projects in the habitable zone, but their stars are much cooler than our Sun, and their orbits are more like that of Venus or Mars, scientists say.