Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

exp NASA's Asteroid Grand Challenge_00002001.jpg
exp NASA's Asteroid Grand Challenge_00002001.jpg

    JUST WATCHED

    Searching for all asteroid threats

MUST WATCH

Searching for all asteroid threats

CNN talks to Jason Kessler about NASA's Asteroid Grand Challenge.

Searching for all asteroid threats

CNN talks to Jason Kessler about NASA's Asteroid Grand Challenge.