NASA hits big milestone by confirming 5,000 planets outside our solar system
NASA has confirmed the existence of 5,000 planets outside our solar system – and that number continues to climb.
Astronomers first discovered a planet outside our solar system in 1992, opening up a new field of science that has grown ever since. Some of these more than 5,000 planets are small rocky worlds like Earth. Others are gas giants several times larger than Jupiter. Some planets revolve around two stars at once; others continue to circle the collapsed remains of dead stars.