Before the Voyager missions to the outer solar system, there was another, earlier Voyager proposal billed as a precursor to manned Mars missions in the 1970s and 1980s. In January 1967, NASA began a campaign to sell congress on Voyager -- just as the Apollo 1 fire left legislators in no mood to discuss NASA's future. In his latest Beyond Apollo post, space historian David S. F. Portree describes the Voyager that never was.
from Wired Top Stories http://www.wired.com