NASA launches the first High Energy Astronomy Observatory satellite in Earth orbit, continuing the survey of the sky with sensitive detectors designed to find gamma ray and X-ray sources. HEAO-1 will remain in service through January 1979, and will re-enter Earth’s atmosphere in March 1979.
theLogBook.com
https://www.theLogBook.com
Earl Green is the creator, curator, and head writer of theLogBook.com.
Also of interest...
Cassini and the ice volcanoes of Titan!
November 9, 2004
NASA exercises the Uranus Option
December 18, 1980
James Webb Space Telescope launched
December 25, 2021