A 'city-killer' asteroid might hit Earth—how worried should we be?
A colossal explosion in the sky, unleashing energy hundreds of times greater than the Hiroshima bomb. A blinding flash nearly ...
How do we stop an asteroid? From emergency space missions to mass evacuations, it’s all on the table
Emergency space missions. Blowing up an asteroid. Mass evacuations. Here’s what the response to an imminent impact could look like.