coming home from iraq. we ll show you how one army base is handling the news they have waited so long to hear. at this moment, somewhere overhead, an old broken satellite is plummeting to earth. no one s quite sure exactly where it will land. it s not the first time we faced a threat from space. experts say it won t be the last. earlier i spoke with tariq malec, managing editor at space.com. he explained why we re likely to face this threat more often. this isn t the last one that s going to be coming down. in a couple years, in 2013, a u.s./japanese satellite will fall out of space. and we just saw a huge nasa satellite fall last month. these are old. this one coming down tonight, 21 years old. similar ages for the other ones that are coming down now. there s a lot of stuff, thousands of pieces of space, hundreds of dead satellites over the years that are going to have to be dealt with one way or another. now, when it comes back into the atmosphere, how big are the pie