YR4, a potential “city-killer,” has a small chance of hitting Earth in 2032—but scientists say it might strike the Moon instead. Measuring up to 90 metres wide, the asteroid could create a dramatic lunar impact,

YR4 has a 2.3% chance of hitting Earth in the year 2032. But according to new estimates, it may have an even smaller chance of hitting the moon instead.

Scientists say the threat of a newly discovered asteroid has risen slightly in the past few weeks, as the world's telescopes rush to track its course.