The star is known as Tau Ceti, which resides just 12 light-years away. That's further than Alpha Centauri (at just four light-years) but the Tau Ceti finding is significant. The Alpha Centauri exoplanet orbits its star at too close a distance to harbor surface water--it's simply too hot. The potential planet orbiting Tau Ceti, though its precise composition is unknown, looks to be a rocky planet like Earth. And it's orbital distance is such that liquid water could exist on the planet's surface.