Moffett Feild, Calif. -- The U.S. space agency says its Kepler Space Telescope has started its 3 1/2-year search for Earth-like worlds among more than 100,000 stars.
National Aeronautics and Space Administration scientists said Kepler, launched in March, has the ability to find planets as small as Earth that orbit sun-like stars at distances where temperatures are right for possible lakes and oceans.
"Now the fun begins," said William Borucki, Kepler's principal investigator at NASA's Ames Research Center, located at Moffett Field, Calif. "We are all really excited to start sorting through the data and discovering the planets."
NASA scientists and engineers have spent the two months Kepler has been in orbit checking and calibrating its instruments.