NASA announced, after analyzing data from their Kepler space telescope, that 17 billion planets in the Milky Way galaxy are Earth-like. Even better, four planets have actually been identified to be in their sun's habitable zone, the region in the planetary system where liquid water might exist on the surface of a planet. Continue reading for a video and more information.
Here's what Steve Howell, of NASA's Ames Research Center in California, has to say: "The analysis of increasingly longer time periods of Kepler data uncovers smaller planets in longer period orbits -- orbital periods similar to Earth's. It is no longer a question of will we find a true Earth analogue, but a question of when."