Has NASA Found an Exo Earth?

The hunt for alien life has been given a boost after scientists discovered a habitable planet almost the same size as Earth.

Astronomer Thomas Barclay from Nasa's Ames Research Centre in California made the discovery using data collected by the Kepler space telescope.

The unnamed planet was found orbiting an unidentified star in its so-called Goldilocks zone - a region around the star that emits just enough energy, light and temperature for liquid surface water to appear.