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PRONAOS is a French balloon-borne 2-meter submillimeter telescope for astronomy. Developed and operated from 1986 to 1999, it has been a precursor for the two European space missions to be launched in 2007: FIRST and Planck-Surveyor. PRONAOS has been built as a light and autonomous space platform able to resist the very hostile environment at the altitude of 40 kilometers. It has thus driven many...
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