In our search for a habitable Planet in a separate Solar System from that of our own, the Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.
The discovery sets a new record for the greatest number of habitable-zone planets found around a single star outside our solar system.
All of these seven planets could have liquid water, key to life as we know it under the right atmospheric conditions, but the chances are highest with the three in the habitable zone.
At about 40 light-years from Earth, the system of planets is relatively close to us, in the constellation Aquarius. Because they are located outside of our solar system, these planets are scientifically known as exoplanets.