NASA’s Kepler spacecraft has discovered a far off planet that orbits its sun at just the right distance to support life. They are calling the planet Kepler-22b and it is 2.4 times bigger then earth and located about 600 light years away. Kepler-22b is warm, with an average surface temperature of 72 degrees, plenty warm enough for liquid water to exist.
Kepler was launched in March 2009 and in just 16 months the spacecraft has discovered 2,326 potential planets. It discovers planets by looking for small changes in a star’s brightness… That indicates a planet is transiting the star from the spacecrafts vantage point. Of the potential planets found 700 are larger than earth, while 207 are about the same size.