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High Energy Astrophysical Observatory

  NASA's series of High Energy Astrophysical Observatory spacecraft, labeled A, B, and C in this old illustration, were later named HEAO-1, HEAO-2 (“The Einstein Observatory”), and HEAO-3 respectively. The first two studied the X-ray sky, discovering many remarkable and unexpected objects. HEAO-3, launched in 1979, measured high-energy cosmic-ray particles and gamma rays. Credit: MSFC Historical Archive, NASA
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