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 ...
Are we all aliens? NASA's returned asteroid samples hold the ingredients of life from a watery world
Asteroid samples fetched by NASA hold not only the pristine building blocks for life but also the salty remains of an ancient water world, scientists reported Wednesday.
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.