It's Official: Researchers Have Discovered A Second Earth

We know of only one planet where life survives – Earth. When we hunt for life outside our solar system, we emphasis on discovering planets with features that mimic that of Earth, said Elisa Quintana, research scientist at the SETI Institute at NASA's Ames Research Center in Moffett Field, Calif., and lead author of the paper published in the journal Science. Discovering a habitable zone planet similar to Earth in size is a major breakthrough.