TERMIUM Plus^®

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The project, named Gravity Research Mission(GRM), was to map the Earth's gravity and magnetic fields using to drag-free spacecraft orbiting in polar orbit at very low altitude. The project disappeared in 1987.  1, fiche 1, Anglais, - Gravity%20Research%20Mission

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The polar-orbiting spacecrafts serve as complementary satellites to the geosynchronous Geostationary Operational Environmental Satellites (GOES) system.  2, fiche 2, Anglais, - polar%20orbiting%20spacecraft

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The scientific objective of POLO [Polar Orbiting Lunar Observatory] is to make a complete global survey of the Moon's physical and chemical properties using two spacecraft, one in low-altitude polar orbit about the Moon, the other in high-altitude lunar orbit. The basic payload of the Orbiter would contain X-and gamma-ray spectrometers, a multispectral stereo imaging system, a reflectance spectrometer, an altimeter, a magnetometer and an alpha-particle detector.  1, fiche 3, Anglais, - reflectance%20spectrometer

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