For their research, scientists spent five years studying 166 Sun-like stars within 80 light year - or 470 trillion miles - of Earth.

研究中，科学家们用五年时间分析计算了166个距离地球80光年(470兆英里)以内的类日恒星。

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The discovery suggests habitable planets must be common, with 10 to 20 per cent of red dwarfs and sun-like stars boasting them, the team says.

这个发现表明可居住的星球一定是普遍的，大约有百分之十到二十的红矮星和类似太阳的行星周围有宜居星球。

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"This represents a significant step toward Kepler's goal of determining the frequency of Earth-size planets in the habitable zones of Sun-like stars," Dr.Holman said.

“这代表开普勒团队向实现其目标迈出了重要一步，他们的目标是确定在类太阳恒星周围的可居住地带出现地球大小的行星的频率，”霍尔曼博士说。

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Finding habitable earth-like planets around other sun-like stars has never been an easy task.

FORBES: Earth-Like Exo-Moons Can Lurk Well Beyond Planetary Habitable Zones, Say Astronomers

NASA-funded astronomers have located two planets located within a dense cluster of sun-like stars.

FORBES: Astronomers Find Planets Within A Cluster Of Stars

Advanced science instruments aboard future spacecraft, such as the proposed European Plato mission, could find many more Earth-mass planets orbiting Sun-like stars.

BBC: Telescope sees smallest exoplanet