Wow. There are a lot of NEO objects out there. Common wisdom is to believe that space is vast and empty, but near stars it seems to be false. Of course, with the distances involved, it really is sparse; but from an outside observer, it’s a lot more crowded in here than most think it is.
Below is a video of all the asteroids discovered from 1980 to 2010. Around the 1990 mark, large swaths of asteroids were being discovered by automated system.