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Uhuru is a space-based X-ray telescope launched by NASA in 1970 for a 3-year mission, surveying the sky at a 30 arc minute Angular Resolution, to about 1.5 × 10-18Joule/cm2/sec over 2-20keV. https://heasarc.gsfc.nasa.gov/docs/uhuru/uhuru.html https://heasarc.gsfc.nasa.gov/W3Browse/uhuru/uhuru4.html
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