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They accomplished a lot up here, space walker mike fincke holds the u.s. record for time in space, 380 days. >> i hope my record is soon broken. >> reporter: but their most important project here is to explain possible origins of the universe, hauling this machine into space so they can search for unusual types of matter. >> all right, you astronauts, you have about 10 seconds to explain to me exactly what alpha magnetic spectrometer does in trying to find origins of the universe. go ahead. >> understanding what the universe is, how it all got here, how it was formed these are fundamental ques...

A lot of people aren't sure he should leave during this time. the first african-american to walk in space, author of the book "dreamwalker: a journey of achievement and inspiration." gerard, good to see you. thanks for being with us. >> good to be here, ali. >> i sort of have separation anxiety normally. an issue to me, and i think for most people, to counter the excitement of being a space walker, being an astronaut, you are going into this astronaut, you are not going to return to earth even if things go well, usually, for some length of time. i assume most people who are astronauts have ove...

Families don't like t. exactly. it's very tough. you have to approach it from the standpoint you're not coming back. you have to prepare your will. make sure you have adequate life insurance to take care of the family as you're gone, and sit douc down and talk about, what happens if i don't come back? what does the family look like? and that's tough. >> what is the sense of mission involved in this? this is not the same as going on a vacation or doing something that you feel you want to do as much as astronauts are very compelled to do this, there is a larger sense of mission involved in being...

Get the spare in place. but they are having trouble with the cold stiff lines in the vacume of space. it is like maneuvering an elephant truck. you can have a ammonia leak and decreasing the coolant on the pace station. >> tom, you robbery out there and pace walker and watching this separation. they are so close together. it is a difficult procedure. we are told that they are even clashed into each other. their helmets. how risky is it for them. >> there is always element of risk. you can snag your suit or slice your and vented your

We reflect on the achievements and struggles for african-americans in black history month, you fulfilled a remarkable dream and the dream of so many young children of any color. did you blaze a trail so that others can do that after you? it is a possibility for a young black student to become a space walker and an astronaut? >> well, you know, certainly, when i dreamed 40 years ago that i would follow in the footsteps of neil armstrong and buzz al dr aldrin i did not set out to be the first african-american. that just happened. but what a wonderful event. >> you have gone through efforts to ma...