SP-4212
On Mars: Exploration of the Red Planet. 1958-1978

A proposed 10-year programming chart was shown to NASA Administrator Glennan at the 8 July 1960 planetary program briefing.

A proposed 10-year programming chart was shown to NASA Administrator Glennan at the 8 July 1960 planetary program briefing. The proposals for launch vehicle upper stages above the timeline would use nonconventional-ion and electric-propulsion. (SNAP stands for "system for nuclear auxiliary power"; SNAP VIII would produce 60 kilowatts of electrical power.) Proposals for upper stages shown below the timeline would use conventional-chemical-propulsion.

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