Jet Propulsion Laboratory (U.S.). Mars Observer Project.

In 1980, the NASA Advisory Council formed the Solar System Exploration Committee (SSEC) to formulate a long-range program for planetary exploration. This program would build on the scientific strategies developed by the Committee on Lunar and Planetary Exploration of the National Academy of Science's Space Science Board, and would also recognize the fiscal constraints likely to apply to NASA's science program in the foreseeable future.

As a result of extensive investigation of scientific priorities, mission opportunities, launch vehicle and technology capabilities, and overall program planning for affordability and basic supporting research, the SSEC's initial recommendation in 1983 was establishment of a Core program for planetary exploration through the year 2000.

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