Astronomers have previously found single planets with two suns, like Tatooine in Star Wars. (newscientist.com)
Of the thousands of planetary systems Kepler has discovered, about 80 per cent appear as single planets passing in front of their stars. (newscientist.com)
«They don't occur all the time, and this is one reason why you can't explain the large number of single planets purely through this mechanism,» Mustill says. (newscientist.com)