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Scientists from NASA's Kepler project have discovered a sun called KOI-961 with a solar system that contains three rocky planets that are smaller than Earth. The planets are too hot and close to the star to be habitable for humans but finding three exoplanets so small gives hope for the existance of a planet similar to Earth where life could exist. A year on these planets, one orbit around their sun, lasts about 2 days.
Currently Kepler scientists are monitoring 150,000 stars for changes in their light which indicates a planet is passing in front of it.