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. But the chance of an impact is still quite slim. New calculations suggest there's a 2% chance the space rock 2024 YR4 will smack Earth in 2032.

YR is considered to be larger than the Chelyabinsk asteroid that struck Russia in 2013. Its shock wave was strong enough to injure 1,500 people.