The estimated flight path of an asteroid the size of Big Ben’s tower will see it pass over some of the world’s most populous cities, according to the latest data from Nasa.Asteroid 2024 YR4 currently has a 2.

The threat posed by the space rock, estimated to be between 40 and 90 metres in diameter, is the highest ever recorded for an object of its size.

NASA increased the chances of asteroid 2024 YR4 hitting Earth to 1 in 32, or 3.1%, on Tuesday, but they're now back down to 1 in 67, or 1.5%.