CNN The Situation Room May 31, 2013 21:01:00
Earth objects, large, large asteroids that are out there that they are watching and they've been able to basically see about 95% of those. they know where they are. the scientists here did calculations years in advance. this particular one, the 1998 qe-2 as it is called was discovered 15 years ago and they knew then because of their calculations, calculus by the way, that it would not hit earth. they've known it for a very long time. what they are excited about is it is coming very close in scientific terms and they will be able to see it using radar, which means they'll be able to see the pro...