An asteroid the size of an office building will zoom close by Earth next week, but it's not on a collision course, NASA says.
Still, some people think this near-miss should serve as a wake-up call.
"It's a warning shot across our bow that we are flying around the solar system in a shooting gallery," says Ed Lu, a former astronaut and head of the B612 Foundation, a nonprofit dedicated to protecting humanity from asteroids.
The asteroid known as 2012 DA14 was first spotted last year by astronomers in Spain. It's thought to be about 150 feet across and made of rock.