File:Third High Energy Astronomy Observatory 8003541.jpg

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Description	English: Managed by the Marshall Space Flight Center and built by TRW, the third High Energy Astronomy Observatory was launched September 20, 1979. HEAO-3 was designed to study gamma-rays and cosmic ray particles.
Date	1 January 1979
Source	https://archive.org/details/MSFC-8003541
Author	NASA

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