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NASA announced that it would ask scientists to propose experiments for a satellite-measurements program called OPEN (origins of plasmas in Earth's neighborhood) that would attempt for the first time to explain collective behavior of components of the geospace system: the interplanetary medium near Earth, magnetosphere, ionosphere, and upper atmosphere. Previous programs detected extensive interaction among all geospace components. The new mission would use a minimum of four spacecraft in widely different orbits in key regions of space for measurement and remote sensing of electromagnetic radiation, fields and particles, and plasmas (electrified matter) and defining the flow of mass, momentum, and energy through the solar wind and electrified environment near Earth. Launched during a year in the mid-1980s by the Shuttle, each spacecraft would be capable of significant orbit changes over a four-year lifetime to permit observing a vast volume of space. [[GODDARD SPACE FLIGHT CENTER|GSFC]] would manage the project. (NASA Release 79-173) *[[November 1979|November]] *[[December 1979|December]] [[Dec 1 1979|1]] [[Dec 2 1979|2]] [[Dec 3 1979|3]] [[Dec 4 1979|4]] [[Dec 5 1979|5]] [[Dec 6 1979|6]] [[Dec 7 1979|7]] [[Dec 8 1979|8]] [[Dec 9 1979|9]] [[Dec 10 1979|10]] [[Dec 11 1979|11]] [[Dec 12 1979|12]] [[Dec 13 1979|13]] [[Dec 14 1979|14]] [[Dec 15 1979|15]] [[Dec 16 1979|16]] [[Dec 17 1979|17]] [[Dec 18 1979|18]] [[Dec 19 1979|19]] [[Dec 20 1979|20]] [[Dec 21 1979|21]] [[Dec 22 1979|22]] [[Dec 23 1979|23]] [[Dec 24 1979|24]] [[Dec 25 1979|25]] [[Dec 26 1979|26]] [[Dec 27 1979|27]] [[Dec 28 1979|28]] [[Dec 29 1979|29]] [[Dec 30 1979|30]] [[Dec 31 1979|31]] *[[1980]]

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