| 1 | At this time a new stage of orbital station creation was begun. | |
| 2 | International crews took part in flights to the orbital stations. | |
| 3 | The original plan called for building a shuttle fleet and an orbiting space station at the same time. | |
| 4 | NASA faces a year 2010 deadline for completing the building of the orbiting space station and of retiring the shuttles. | |
| 5 | The Nixon administration rejected NASA' s post-Apollo plans for permanent Moon bases, orbiting space stations and flights to Mars. |
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