An asteroid is passing relatively close (in astronomical terms) to the Earth today. The rock is roughly 300m in diameter, and will pass within a distance roughly twice that of our moon’s orbit.
“If it struck land, it would wipe out an entire country. If the impact point were London, then scientists estimate there would be total devastation for 150 km and severe destruction for a further 800 km, meaning that not only would the UK be destroyed but France and the Low Countries as well.”