Scientists may need to use nuclear weapons to defend earth from asteroid

It's got the innocuous name 2024 YR4, but this large piece of rock could cause "severe damage" if it hits a major town or city.

Scientists are warning that the large asteroid could collide with the earth on 22 December 2032.

The odds of a serious strike are 1/67, but in astronomy terms, that is significant.

Astronomer David Whitehouse told Sky News authorities may need to take measures to deflect the rock if it looks like a collision is likely.