. >> reporter: i spoke to astronauts victor glover and mike hopkins in whierpa n. ometim have t the station. sometimes we don't. so it is a constant something that we're always worrying about up here and something that we have to be mindful of. >> reporter: and if there is no time to move the space station? >> then you have to take shelter, get in basically your rescue vehicle and be prepared to desport the station. >> reporter: peggy woodson has spent more time in space than any american. >> my second flight i think we had to do one debris avoidance maneuver. and we did three or four on my last one. there is a greatly increasing number of objects out there. >> there is an old saying that space is big. not anymore. it's getting smaller and smaller epn cress a specialbris. likeany abthss kes was an enginee at , and h edicted thatebris d wld cde i think in 50 years, if we don't do something, probably the delicious's going to be so great it's not even worth putting satellites up there. we definitely don't want to do that. >> reporter: so what are the proposals for cle