Here's a prime example of what could have been. NASA's Integrated Program Plan was director Thomas Paine vision for making America's manned presence in space permanent rather than sporadic. The idea was to turn space travel into an integrated system using modular parts to build spacecraft, tugs, stations and fledgling colonies on the Moon and Mars.
Sadly, politics meant that it never left the drawing board.
Sometimes the saddest words of all are, "What might have been . . ."
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