What's So Special About DART's Impact?

Slica: We know that getting more details is helping astronomers understand why this crash was so successful. She says the fact that DART made a dent at all really comes down to its high velocity impact, which we already said was about 14,000 miles per hour. Slica: What else would we need in order to ensure that any more dangerous asteroids headed for the Earth don't obliterate us? The key is to get a catalog of different sizes of objects, their different orbits, maybe even what they're made of and figure out which ones are the most threatening.