A dive into probabilities, asteroid impact modeling, and what sort of damage an approximately 180-foot asteroid could cause on Earth.

UN planetary defence organisations are closely monitoring an asteroid that has a tiny risk of hitting the Earth. The European Space Agency (ESA) has said that it has an almost 99% chance of safely passing Earth on 22 December 2032, but a possible impact "cannot yet be entirely ruled out".

YR4 was first discovered in December last year by a telescope in Chile. The near-Earth asteroid is as big as a football field, measuring 40 to 100 metres across.