Why Is it so Hard to Detect Dangerous Asteroids Heading to Earth?

Earth is often in the firing line of fragments of asteroids and comets, most of which burn up tens of kilometres above our heads. But occasionally, something larger gets through. That’s what happened off Russia’s east coast on December 18 last year. A giant explosion occurred above the Bering Sea when an asteroid some ten … Continue reading Why Is it so Hard to Detect Dangerous Asteroids Heading to Earth?