KPIX CBS Evening News With Norah ODonnell November 24, 2021 23:45:00
Officer, responsible for mapping thousands of near-earth asteroids, seen here in blue, that could threaten earth. so far, 10,000 seem big enough to cause a calamity if they were to hit our planet. in 2013, a small asteroid, roughly 60 feet across, exploded over russia, injuring more than 1600 people. >> if they were to impact, particularly in a populated area, it would be a natural disaster on the order of anything that we've ever dealt with. >> reporter: how vulnerable is the earth to one were these objects? >> if it's a large object, currently nothing to stop it. >> liftoff. >> reporter: nas...