This artist's conception illustrates Kepler-22b, a planet known to comfortably circle in the habitable zone of a sun-like star. It is the first planet that NASA's Kepler mission has confirmed to orbit in a star's "habitable zone" -- the region around a star where liquid water, a requirement for life on Earth, could persist.
NASA announced a major milestone in the quest for life in the universe Monday: The discovery of another planet close enough to the sun it orbits to potentially support life.
| by FOX | 2011 |
Called Kepler-22b, the planet is about 2.4 times the radius of Earth and about 600 light-years away.
