Talk about a close shave. On February 15, 2013, an asteroid about half the size of a football field will fly past Earth only 17,200 miles above our planet's surface. This is so close that the asteroid will actually pass inside the ring of geosynchronous satellites, which is located about 35,800 kilometers (22,200 miles) above the equator. There's no danger of a collision, but the space rock, designated 2012 DA14, has NASA's attention.