MOFFET FIELD, Calif., Oct. 16 (UPI) -- Technical problems could keep NASA's Kepler space telescope from its goal of finding Earth-sized planets in habitable zones around other stars, astronomers say.
Launched in 2009, Kepler monitors thousands of stars for dips in brightness, an indication a planet could be passing in front of them. The space telescope needs another four years to complete its exoplanet survey but a critical hardware failure on Kepler this summer has astronomers worried the mission could end at any time, Spaceflight Now reported Tuesday.