Millions Would Die If Tunguska Event-Sized Asteroid Exploded Over NYC | Video
Ed Lu (B612 Foundation/Fmr. NASA astronaut) testified that "whatever the entire population of the city was..would be gone" during a Senate hearing on potentially hazardous asteroids. The 1908 Tunguska Meteor leveled 800 sq. miles of forest.
credit : United States Senate Radio-Television Gallery