Freaky asteroids flew by Earth, and NASA captured footage

A giant NASA radar in the remote Mojave Desert imaged some formidable asteroids — including a 1-mile-wide behemoth — as they passed through our planet's neighborhood.

Fortunately, there are no known asteroids that might potentially hit Earth for over a century, and the likelihood of an impact from the biggest class of asteroids (like the one below) in the next thousand years is exceedingly low. Yet the imagery provides planetary scientists valuable information on what's out there and how...