Look out for Asteroid 2012 DA14.

It is heading toward Earth at 17,450 miles per hour, according to NASA, and the tug of our planet's gravitational field will cause it to accelerate when it gets here.

But it's not going to strike us, when it passes by on February 15. NASA is adamant about this.

"Its orbit is very well-known," said Dr. Don Yeomans, NASA specialist for near-Earth objects. "We know exactly where it's going to go, and it cannot hit the Earth."

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