NASA Has a Plan to Punch an Asteroid With a Spaceship to Protect Earth
Planetary astronomer Andy Rivkin talks to VICE News about the first flight demonstration of planetary defense, called the Double Asteroid Redirection Test (DART) mission.
[vice.com]asteroid-with-a-spaceship-to-protect-earth
Asteroids started it
[astronomy.com]asteroid-dust-found-at-chicxulub-crater-confirms-cause-of-dinosaurs-extinction