Today's Close-Up

Stopping Killer Asteroids (2017x17)

Air date: Jun 03, 2017

When an asteroid strikes the Earth, it can destroy an entire city… or more. Astronomers have so far found about 16,000 asteroids that might cross into Earth's orbit. How can we prevent one of them striking our planet? We look at ideas from astronomers at the Planetary Defense Conference, held in Tokyo last month.