The Kepler spacecraft has been observing stars from 150,000 stars . The stars dim in brightness if a planet passes in front of them . On Thursday , NASA scientists will share news of what they are calling the `` discovery of an intriguing planetary system . '' So far , it has identified more than 100 planet candidates .
The Kepler spacecraft has been observing stars from 150,000 stars . The stars dim in brightness if a planet passes in front of them . So far , it has identified more than 100 planet candidates .