astroengine writes "Plenty of 'candidate' exoplanets exist, but for the first time, Kepler has confirmed the existence of an exoplanet orbiting its Sun-like star right in the middle of its 'habitable zone.' Kepler-22b is 2.4 times the radius of Earth and orbits its star every 290 days. 'This is a major milestone on the road to finding Earth's twin,' said Douglas Hudgins, Kepler program scientist at NASA Headquarters in Washington. 'Kepler's results continue to demonstrate the importance of NASA's science missions, which aim to answer some of the biggest questions about our place in the universe.'"
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