The asteroid currently has about a 2 per cent chance of colliding with Earth in December 2032, according to NASA and the European Space Agency.

A colossal explosion in the sky, unleashing energy hundreds of times greater than the Hiroshima bomb. A blinding flash nearly as bright as the sun. Shockwaves powerful enough to flatten everything for miles.

YR4 has a roughly 2 percent chance of hitting Earth in 2032, and “is large enough to cause localized damage,” NASA says.

The world’s top astronomers are closely watching an asteroid they say has a 2.3% chance of hitting earth in 2032 - up from just 1% last month. Tom explains what they’re looking for and what scientists are doing to prepare.