Before it was destroyed, a vast, destroyed observatory recorded a final scary asteroid warning. The Arecibo Observatory in Barrio Esperanza, Arecibo, Puerto Rico, closed in 2020, but its final data included the world’s largest radar-based near-Earth asteroid report. It is made up of 191 known asteroids, 70 of which have been classed as ‘potentially hazardous.’ A potentially hazardous asteroid approaches