4 Earth-sized planets found orbiting nearest Sun-like star
An international team of astronomers has detected four Earth-sized planets orbiting Earth's nearest Sun-like star, tau Ceti, which is about 12 light-years away from Earth and visible to the naked eye. Two of them are located in the habitable zone, meaning they could support liquid surface water. The planets were detected by observing wobbles in the movement of tau Ceti.