. >> explorer, this is kowalski reporting visual contact with debris.e sat... >> martin: the movie "gravity" dramatized the devastating effect manmade debris travelling at 17,000 miles per hour could have on the international space station. the jspoc tracks dead satellites, old rocket boosters, even stray space gloves, and alerts satellite operators and astronauts if a collision is likely. >> raymond: last year, in 2014 the international space station was maneuvered three times to avoid colliding with a piece of debris. a lot of the debris that's threatenin was created in 2007 when the chinese tested a ground-based anti-satellite weapon. it crashed into one of their old weather satellites 530 miles above the earth, shattering it into pieces. >> raymond: this is the debris that resulted from the 2007 chinese a-sat. so this is about 3,000 pieces of debris just from that one event. >> martin: that came just from that one collision? >> raymond: just from that one collision. >> martin: debris apart, how important was that test in terms of revealing chinese s