Watch Live: Defending Earth from Asteroids with Neil Tyson

Asteroids orbit the Sun between Mars and Jupiter in the asteroid belt. But near-Earth asteroids come much closer to our planet. Major collisions are exceedingly rare, but there are about a million near-Earth asteroids that are large enough to substantially damage or destroy a major city. » 10/24/13 12:01pm 10/24/13 12:01pm

How to defend Earth from incoming asteroids

There are about a million near-Earth asteroids that are large enough to damage or destroy a major city, as evidenced by the explosion over Chelyabinsk, Russia, this past February of a meteor that injured more than 1,000 people. This month, Ukrainian astronomers detected a 1,350-foot-wide asteroid that made a close… » 10/18/13 5:06pm 10/18/13 5:06pm