The chance that a city-killer asteroid will impact Earth in 2032 is steadily rising. Here's what you need to know.

YR4 has a small chance of hitting Earth in 2032, but as astronomers make more observations about its trajectory, the odds of a collision seem to be increasing

An asteroid between about 130 and 300 ft. (40 and 90 meters) in diameter has been given a 2.3% chance of it hitting Earth on Dec. 22, 2032.