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High Energy Astrophysical Observatory

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noun
  1. one of a series of three U.S. satellites launched (1977–79) into orbit around the earth and equipped with instruments for studying high-energy phenomena, as x-rays, gamma rays, and cosmic rays. Abbreviation: HEAO
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018