NASA is marking two milestones in the search for planets like Earth; the successful completion of the Kepler Space Telescope’s 3 1/2- year prime mission and the beginning of an extended mission that could last as long as four years.
NASA is marking two milestones in the search for planets like Earth; the successful completion of the Kepler Space Telescope’s 3 1/2- year prime mission and the beginning of an extended mission that could last as long as four years.