Apophis may pose a great challenge for world leaders. As it swings past Earth in 2029, there's a slim chance that Earth's gravity will deflect the asteroid just enough to put it on a certain collision course with our planet on the next pass, in 2036. The odds are currently estimated at one in 45,000, so a strike is very unlikely. Meanwhile, astronomers will continue to track Apophis to learn if it will merely taunt us again, or actually strike.