Space ShuttleNASA formally asks various major players in the aerospace industry for proposals for what the agency sees as its two major projects for the 1970s: an orbiting space station and a reusable Space Shuttle to make routine flights from Earth to the station – which NASA hopes will be a “50 man space base” – and back again, with supplies, experiments, and new crew members. (Within mere weeks, the hypothetical station’s equally hypothetical crew will be downsized to a dozen.) In the event that the development curve on the Space Shuttle proves to be a long one, NASA says it will keep Apollo and even Gemini spacecraft in service to make flights to the station.