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Lunar Observer plans include an ultraviolet spectrometer as well as ion and neutral-atom mass spectrometers for atmosphere studies. STPSat-1's payload comprises three experiments: the primary experiment, Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER), is a high-resolution ultraviolet spectrometer based on the new optical technique known as Spatial Heterodyne Spectroscopy ( Galileo's two ultraviolet spectrometers have shown, as expected, that hydrogen atoms at Earth's distance from the sun last about 1 million seconds (almost 12 days) before ionizing, says Charles W. |
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