losing the space shuttle also mean losi valuable expertise.huttle is the flagship of the american aerospace industry. that pride is on display here at the space center in houston. many do not understand why the shuttle is being retired without a replacement. >> i think it is a terrible thing they are retiring it. they need to continue it and find the money to do it. >> it is sad to see it retire. it is good to see things move on and to the next step. >> but who will take the next step forward? many americans want their country at the forefront of space exploration. >> i would love to see as going to mars. i was watching a program the other night about how they're making a space suit to handle the pressure. i think that would be very useful. >> hopefully in my lifetime, a person setting foot on another lanet would be very exciting. i hope we will continue to support that as a country. >> back at the training center, three astronauts to demonstrate the docking maneuver. sps-135 will be the final space shuttle mission was just four members on boa

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