A graphical look at our close-encounter with YU55

An excerpt from this article:
Since a humble start at a single telescope in the 1980s, NASA’s $5 million-per-year asteroid-tracking program has matured to the point where the agency said in September that it has detected more than 90 percent of “planet killer” asteroids, those bigger than one kilometer in diameter. None will hit Earth in the foreseeable future, the agency has said.




Source: SPACE.com: All about our solar system, outer space and exploration