100 Spaceflights and Counting

This summer's flight of space shuttle Discovery marks a milestone for the U.S. space program: the 100th space flight since Alan Shepard's first Mercury mission in 1961. Greg Harbaugh, who will fly on the 101st mission, an historic docking with the Russian Mir spacestation, says its just a prelude. "What this is all about, is about going to Mars".

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