It happened to the dinosaurs, and it could happen to us if we are not prepared: a killer asteroid. Thousands of meteorites bombard earth every year. Most of them cause little destruction but NASA knows that the risk of an earth-destroying asteroid heading our way is a real concern. The first big step forward in a plan to defend the planet is the DART program. During the first-of-its-kind mission, a spacecraft slammed into asteroid to push it off orbit. For the New Reality, Su-Ling Goh looks at what was learned from the DART mission and how Canadian scientists are helping NASA's planetary defence program.